#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);
}

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