#include <stdio.h>
int main (void)
{
int x,y;
char z;
scanf("%d%c%d",&x,&z,&y);
y+=5;
if(y>=60)
{
x+=1;
y-=60;
if(x>=24)
{x-=24;}
}
printf("%d:%d",x,y);
return 0;
}