#include <stdio.h>

int main() {
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    
    if (a < 0 || b < 0 || c < 0) {
        printf("Invalid input");
    }
    else if (a == b && b == c) {
        printf("Equilateral");
    }
    else if (a == b || b == c || a == c)
        printf("Isosceles");
    }
    else {
        printf("Scalene");
    }
    
    return 0;
}