#include <cstdio>

#define X 1000000000
#define P 30

int main() {
  int T;
  scanf("%d", &T);
  for (int t = 1; t <= T; t++) {
    long L, R;
    scanf("%d %d", &L, &R);
    printf("Case #%d: %d\n", t, 0);
  }
  return 0;
}