#include <stdio.h>
#include <math.h>

int main()
{
    double a, b, c;
    scanf("%lg%lg%lg", &a, &b, &c);
    if (fabs(a*a + b*b - c*c) < 1e-10) {
	printf("that's a right-angled triangle\n");
    } else {
	printf("that's not a right-angled triangle (loser)\n");
	printf("a*a + b*b == %g\n", a*a + b*b);
	printf("     c*c  == %g\n", c*c);
	printf("their difference is %g\n", a*a + b*b - c*c);
    }

    return 0;
}