POJ 2840

#include<iostream>
#include<stdio.h>
#include<string>

using namespace std;

int main()
{
    //freopen("acm.acm","r",stdin);
    int i;
    int num;
    int sum;
    string s;
    cin>>num;
    while(num --)
    {
    cin>>s;
    i = 0;
    sum = 0;
    while(1)
    {
        sum += s[i] - '0';
        if(s[++i] != ':')
            sum *= 10;
        else
            break;
    }
     
    if(s[++i] == '0' && s[++i] == '0')
    {
        if(sum == 12)
            cout<<24<<endl;
        else
            cout<<(sum + 12) % 24<<endl;
    }
    else
    {
        cout<<0<<endl;
    }

    }
}