#include <stdio.h> int main() { int hour,min,k; int nowhour ,nowmin; scanf("%d:%d %d",&hour ,&min,&k); nowhour = (hour + (min+k)/60)%24; if((hour + (min+k)/60)%24 ==0) { nowhour = 0; } else nowhour = (hour + (min+k)/60)%24; if((min+k)%60 ==0) { nowmin=0; } else nowmin=(min+k)%60; printf("%02d:%02d",nowhour ,nowmin); }