#include <stdio.h>
#include <math.h>
#include <stdlib.h>
int main (void)
{
long long int x, y, z;
while (scanf("%lld %lld", &x
, &y
) != EOF
) {
if (scanf ("%lld %lld", &x
, &y
) == EOF
) break;
}
return 0;
}
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