#include <iostream>
#include <vector>
#include <string>

/* https://yukicoder.me/problems/no/525 */
int main()
{
    int h,m;
    scanf("%d:%d",&h,&m);
    m+=5;
    if(m>=60) {m=0;h++;}
    if(h>=24) {h-=24;}
    printf("%02d:%02d\n",h,m);

    return 0;
}