#include <iostream>
using namespace std;
int main() {
int sh, sm;
int fh, fm;
scanf("%d:%d", &sh, &sm);
scanf("%d:%d", &fh, &fm);
int start = sh*60+sm;
int finish = fh*60+fm;
int way, rest;
scanf("%d %d", &(way), &(rest));
int x = way + rest;
for(int t=start, i=0; t<finish; t+=x, i++){
printf("%02d:%02d %s", t/60, t%60, i% 2 == 0? "\t":"\n");
}
return 0;
}
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