#include<stdio.h>
int main()
{
int h, m, s;
int n;
scanf("%d:%d:%d",&h,&m,&s);
scanf("%d",&n);
s += n;
if (s >= 60)
{
s %= 60;
m++;
}
if (m >= 60)
{
m %= 60;
h++;
}
if (h >= 24)
{
h %= 24;
}
printf("%0.2d:%0.2d:%0.2d\n",h,m,s);
return 0;
}
方法二:参考别人