#include <stdio.h>
#include <math.h>
int main() {
float x1, y1, x2, y2, distancia = 0;
scanf("%f %f", &x1, &y1);
scanf("%f %f", &x2, &y2);
distancia = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
printf("%.4f", distancia);
return 0;
}
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