题解 | #简单密码#

#include <bits/stdc++.h>
#include <cctype>
#include <string>
#include <utility>
using namespace std;

int main() {
    string input, ans;
    while (cin >> input) {
        for (auto &e : input) {
            switch (e) {
                case '1' :
                case '0' :
                ans.push_back(e);
                break;
                case 'a' :
                case 'b' :
                case 'c' :
                ans.push_back('2');
                break;
                case 'd' :
                case 'e' :
                case 'f' :
                ans.push_back('3');
                break;
                case 'g' :
                case 'h' :
                case 'i' :
                ans.push_back('4');
                break;
                case 'j' :
                case 'k' :
                case 'l' :
                ans.push_back('5');
                break;
                case 'm' :
                case 'n' :
                case 'o' :
                ans.push_back('6');
                break;
                case 'p' :
                case 'q' :
                case 'r' :
                case 's' :
                ans.push_back('7');
                break;
                case 't' :
                case 'u' :
                case 'v' :
                ans.push_back('8');
                break;
                case 'w' :
                case 'x' :
                case 'y' :
                case 'z' :
                ans.push_back('9');
                break;
                case 'A' :
                e = 'a';
                e++;
                ans.push_back(e);
                break;
                case 'B' :
                e = 'b';
                e++;
                ans.push_back(e);
                break;
                case 'C' :
                e = 'c';
                e++;
                ans.push_back(e);
                break;
                case 'D' :
                e = 'd';
                e++;
                ans.push_back(e);
                break;
                case 'E' :
                e = 'e';
                e++;
                ans.push_back(e);
                break;
                case 'F' :
                e = 'f';
                e++;
                ans.push_back(e);
                break;
                case 'G' :
                e = 'g';
                e++;
                ans.push_back(e);
                break;
                case 'H' :
                e = 'h';
                e++;
                ans.push_back(e);
                break;
                case 'I' :
                e = 'i';
                e++;
                ans.push_back(e);
                break;
                case 'J' :
                e = 'j';
                e++;
                ans.push_back(e);
                break;
                case 'K' :
                e = 'k';
                e++;
                break;
                ans.push_back(e);
                case 'L' :
                e = 'l';
                e++;
                ans.push_back(e);
                break;
                case 'M' :
                e = 'm';
                e++;
                ans.push_back(e);
                break;
                case 'N' :
                e = 'n';
                e++;
                ans.push_back(e);
                break;
                case 'O' :
                e = 'o';
                e++;
                ans.push_back(e);
                break;
                case 'P' :
                e = 'p';
                e++;
                ans.push_back(e);
                break;
                case 'Q' :
                e = 'q';
                e++;
                ans.push_back(e);
                break;
                case 'R' :
                e = 'r';
                e++;
                ans.push_back(e);
                break;
                case 'S' :
                e = 's';
                e++;
                ans.push_back(e);
                break;
                case 'T' :
                e = 't';
                e++;
                ans.push_back(e);
                break;
                case 'U' :
                e = 'u';
                e++;
                ans.push_back(e);
                break;
                case 'V' :
                e = 'v';
                e++;
                ans.push_back(e);
                break;
                case 'W' :
                e = 'w';
                e++;
                ans.push_back(e);
                break;
                case 'X' :
                e = 'x';
                e++;
                ans.push_back(e);
                break;
                case 'Y' :
                e = 'y';
                e++;
                ans.push_back(e);
                break;
                case 'Z' :
                ans.push_back('a');
                break;
                default:
                ans.push_back(e);
                break;
            }
        }
        cout << ans;
    }
    return 0;
}