Clock

#include <stdio.h>

int main(){
    int tc,time,hrs,scs;
    scanf("%d",&tc);
    for(int i=1;i<=tc;i++){
        scanf("%d",&time);
        hrs = time/60;
        scs = time%60;
        printf("Case #%d: %02d:%02d\n",i,hrs,scs);
    }
    return 0;
}