#include <iostream>
#include<cstring>
using namespace std;
int main()
{
char a[1005];
int len,i,sum=0;
gets(a);
len=strlen(a);
for(i=0;i<=len-1;i++){
sum++;
if(a[i+1]!=a[i]){
if(sum==1){
printf("%c",a[i]);
sum=0;
}
else{
printf("%d%c",sum,a[i]);
sum=0;
}
}
}
}
https://blog.csdn.net/weixin_42807063/article/details/91414714