This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, res = 0;
cin >> n;
string str;
cin >> str;
for(int i = 1;i < n;++i){
if(str[i] == str[i - 1]){
int index = -1;
for(int j = i + 1;j < n;++j){
if(str[i] != str[j]){
index = j;
break;
}
}
if(index == -1){
cout << -1 << '\n';
return 0;
}
while(str[i] == str[i - 1]){
swap(str[index], str[index - 1]);
res++;
index--;
}
}
}
cout << res << '\n';
}
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