#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>
#include <map>
#include <set>
#include <queue>
#include <stack>

#define ALL(x) (x).begin(),(x).end()
#define RALL(x) (x).rbegin(),(x).rend()
#define REP(i,a,n) for(int i = (a);i < (n);i++)
#define PI 3.14159265359
#define MOD 1000000007
#define chmax(a,b) if(a < b)a = b

using namespace std;

int main(){
    int a,b;
    char c;
    double d;
    scanf("%d %d UTC%c%lf",&a,&b,&c,&d);
    a = (24+a)*60 + b;
    d *= c == '-' ? -1 : 1;
    d = 9 - d;
    a -= 60*d;
    b = a%60;
    a /= 60;
    a %= 24;
    printf("%02d:%02d\n",a,b);
    return 0;
}