#include<stdio.h>
int main()
{
    int a, b, c, d ,e ,f;
    scanf("%d%d%d%d",&a,&b,&c,&d);
	e=c-a-f/60;
	f=60-b+d;
    if (d<b)
        e=e-1;
    else
        e=e;
    if (0<f&&f<60)
        printf("%d%d\n",e,f);
    else
        printf("%d\t%02d\n",e+f/60,f+f%60);
    return 0;
}