AC answer

#include <bits/stdc++.h>

using namespace std;

string s;
int n;

void work()
{
cin>>s;
cin>>n;
while(n--)
{
string s1="";
int ans=1;
for(int i=1;i<s.size();i++)
{
if(s[i]==s[i-1])
ans++;
else
{
s1+=ans+'0';
s1+=s[i-1];
ans=1;
}
}
s1+=ans+'0';
s1+=s[s.size()-1];
s=s1;
}
cout<<s;
}

int main()
{
work();
return 0;
}