Base64

python解法，应该是最简单的了吧：

while True:
    try:
        a = input()
        while len(a) > 76:
            print(a[:76])
            a = a[76:]
        print(a)
        print()
    except:
        break

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()){
            String str=sc.next();
            int len=str.length();
            int index=0;
            while(len>index*76){
                String subStr="";
                if(len>(index+1)*76)
                    subStr=str.substring(index*76,(index+1)*76);
                else
                    subStr=str.substring(index*76);
                System.out.println(subStr);
                index++;
            }
            System.out.println();
        }
    }
}

#include <cstdio>
#include <limits.h>
#include <vector>
#include <functional>
#include <string>
#include <iostream>

using namespace std;

int main()
{
 //freopen("in.txt", "r", stdin);
 string s;
 while (cin >> s)
 {
  int count = 0;
  for (auto& c : s)
  {
   ++count;
   if (count == 77) { count = 1; cout << endl; }
   cout << c;
  }
  cout << endl << endl;
 }

 return 0;
}

import java.io.*;
public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		String s = null;
		while ((s = bf.readLine()) != null) {
			int i;
			for (i = 0; i < s.length() - 76; i += 76)
				System.out.println(s.substring(i, i + 76));
			System.out.println(s.substring(i));
			System.out.println();
		}
	}
}

#include<iostream>
#include<string>
using namespace std;
int main()
{
    string str;
    while(getline(cin, str))
    {
        int i = 0;
        while(str[i] != '\0')
        {
            if(i%76 == 0 && i != 0)
                cout << endl;
            cout << str[i++];
        }
        cout << endl <<endl;
    }
    return 0;
}

#include<iostream>
#include<string>
using namespace std;
int main()
{
	string s;
	while (getline(cin, s))
	{
		string res;
		int i = 1;
		for (; i <= s.size(); i++)
		{
			if (i % 76 != 0)
				res += s[i - 1];		
			else
			{			
				res += s[i - 1];
				res += "\n";
			}
		}
		if (i % 76 != 1)
			res += "\n";
		cout << res << endl;
	}
	return 0;
}

try:
    while 1:
        s = raw_input()
        a = len(s)
        if a <= 76:
            print s
        else:
            n = a / 76
            m = a % 76
            for i in xrange(n):
                print s[76 * i:76 * (i + 1)]
            if m != 0:
                print s[-m:]
        print ''
except:
    pass

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner cin =new Scanner(System.in);
        while(cin.hasNext()){
            String s=cin.next();
            int lines=s.length()/76;
            for(int i=0;i<lines;i++){
                System.out.println(s.substring(i*76,(i+1)*76));
            }
            System.out.println(s.substring(s.length()-s.length()%76,s.length()));
            System.out.println();
        }
    }
}

// write your code here
import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);		
		while(sc.hasNext()){
			String str = sc.nextLine();
			Main.getStr(str);	
			
			
		}
		
	}
	public static void getStr(String str){
		int length = str.length();
		for(int i = 0; i < length; i += 76){
			if(length - i >= 76)
				System.out.println(str.substring(i, i+76));
			else{
				System.out.println(str.substring(i));
			}
		}
        System.out.println();
	}
}

#include <iostream>
#include <string>
using namespace std;
int main() {
    string str;
    while(getline(cin, str)) {
    	unsigned int len = str.size();
      	for(unsigned int i = 1; i <= len; i++) {
      		cout<<str[i-1];
      		if( i % 76 == 0)
      			cout<<endl;
      		else if (i== len)
      			cout<<endl;
        }
        cout<<endl;
    }
}

#include <iostream>
#include <string>
using namespace std;

int main()
{
	string str;
	while (cin >> str)
	{
		for (int i = 0; i <= str.size() / 76; ++i)
			cout << str.substr(i * 76, 76) << endl;
		if (str.size() / 76 * 76 != str.size())
			cout << endl;
	}
	return 0;
}

// write your code here cpp

#include<stdio.h>

char base64[50004];

int main()
{
    while(~scanf("%s", base64)){
        char *h = base64, tmp;
        for(int i=0; ; ++i){
            if(h[i] == '\0'){
                printf("%s\n\n", h);
                break;
            }
            if(i == 76){
                tmp = h[76];
                h[76] = '\0';
                printf("%s\n", h);
                h += 76;
                h[0] = tmp;
                i = 0;
                continue;
            }
        }
    }
    return 0;
}