S0为空
S1为接收不同字符
S2为接收相同字符
代码如下：

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

void outputSingles(const string& s)
{
    if(s.empty()) return;
    putchar('1');
    for(string::size_type i = 0, len = s.size(); i < len; ++i){
        putchar(s[i]);
        if(s[i] == '1') putchar('1');
    }
    putchar('1');
}
void outputSames(const string& s)
{
    if(s.empty()) return;
    printf("%u%c", s.size(), s[0]);
}

int main()
{
    string s;
    int state = 0, c;
    
    s.reserve(100);
    while((c = getchar()) != -1){
        switch(state){
            case 0: 
                s.clear();
                if(c == '\n') putchar('\n');
                else{
                    s.push_back(c);
                    state = 1;
                }
                break;
            case 1:
                if(c == '\n'){
                    outputSingles(s);
                    putchar('\n');
                    state = 0;
                }
                else if(c != s[s.size()-1]) s.push_back(c);
                else{
                    outputSingles(s.substr(0, s.size()-1));
                    s = s.substr(s.size()-1);
                    s.push_back(c);
                    state = 2;
                }
                break;
            case 2:
                if(c == '\n'){
                    outputSames(s);
                    putchar('\n');
                    state = 0;
                }
                else if(c == s[s.size()-1]) s.push_back(c);
                else{
                    outputSames(s);
                    s.clear();
                    s.push_back(c);
                    state = 1;
                }
                if(s.size() == 9){ //if length is 9, output this part
                    outputSames(s);
                    state = 0;
                }
                break;
        }
    }
    
    return 0;
}