#include <stdio.h>
#include <stdlib.h>

int main()
{
    int h1,m1,s1,h2,m2,s2,h3=0,m3=0,s3=0;
    printf("Introduceti ora de plecare a autobuzului sub forma hh:mm:ss\n");
    scanf("%d",&h1);
    scanf("%d",&m1);
    scanf("%d",&s1);
    printf("Introduceti durata cursei sub forma hh:mm:ss\n");
    scanf("%d",&h2);
    scanf("%d",&m2);
    scanf("%d",&s2);
    s3=s1+s2;
    if(s3>=60){
        m2++;
        s3=s3-60;
    }
    m3=m1+m2;
    if(m3>=60){
        h2++;
        m3=m3-60;
    }
    h3=h1+h2;
    if(h3>=24) h3=h3-24;
    printf("%d:%d:%d",h3,m3,s3);
    return 0;
}