Seinfeld (POJ 3991, UVALive 4733, HDU 3351, SPOJ ANARC09A, Regionals 2009 >> Africa/Middle East - Africa and Arab)

///     Raihan Ruhin
///     CSE, Jahangirnagar University.
///     Dhaka-Bangladesh.
///     id: raihanruhin (topcoder / codeforces / codechef / uva / uvalive / spoj), 3235 (lightoj)
///     mail: raihanruhin@ (yahoo / gmail / facebook)
///     blog: ruhinraihan.blogspot.com

#include<bits/stdc++.h>
using namespace std;

#define SET(a) memset(a,-1,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define PI acos(-1.0)

#define MOD 1000000007
#define MX 100000


int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int tc, kk=1, n;
    string s;
    while(cin>>s)
    {
        if(s[0]=='-') break;
        int sl=s.size(), balance=0, ans=0;
        for(int i=0;i<sl;i++)
        {
            if(s[i]=='}') balance--;
            else balance++;

            if(balance==-1)
            {
                ans++;
                balance=1;
            }
        }
        ans+=balance/2;
        cout<<kk++<<". "<<ans<<"\n";
    }

return 0;
}