#include <stdio.h>
int main(void) {
    int  a, b, c;
    
    if (scanf("%d %d %d" , &a, &b,&c) !=3) {
        printf("Invalid Input");
        return 0;
    }
    if (a == b && b == c) {
        print f("equilateral");
        return 0;
    }
    if (a == b && b == c) {
        printf("Equilateral");
    }
    else if(a == b || b == c || a ==c) {
        printf("Isosceles");
    }
    else {
        printf("scalene");
    }
    return 0;
}