题解 | #求长方体表面积#

#include<bits/stdc++.h>
//不区分大小写怎么设置
using namespace std;
int main(){
    string sInput;
    char element;
    getline(cin,sInput);
    cin>>element;
    element = toupper(element);//char类型转成大写
    transform(sInput.begin(),sInput.end(), sInput.begin(), ::toupper);//string类型转成大写
    int num = 0;
    for(auto e:sInput){
        if (e == element) ++num;
    }
    cout<<num<<endl;
    return 0;
}