Problem: http://codeforces.com/contest/729/problem/A
Code:
#include<bits/stdc++.h>
using namespace std;
int main()
{
long long n,i;
string s,k;
while(cin>>n>>s)
{
k="";
for(i=0;i<n;i++)
{
if(s[i]=='o'&&s[i+1]=='g'&&s[i+2]=='o')
{
k+="***";
i++;
while(s[i]=='g'&&s[i+1]=='o')
{
i+=2;
}
i--;
//cout<<i<<endl;
}
else
k+=s[i];
// cout<<k<<endl;
//i++;
}
cout<<k<<endl;
}
return 0;
}