SOLUTION OF URI 1015

//   question of uri  1015

Distance Between Two Points

// 1015   (Mahmud_Jamil) BRUR







#include <stdio.h>
int main()
{
    float x1,x2,y1,y2,a;
    scanf("%f %f %f %f",&x1,&y1,&x2,&y2);
    a=sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
    printf("%.4f\n",a);

    return 0;
}