#include<stdio.h>
int main() {
    int a ,b ,c;
    scanf("%d %d %d", &a, &b, &c);
    if(a <= 0 || b <=0 || c <=o){
        printf("Invalid input\n");
        return 0;
    }
    if (a == b && b == c) {
        printf("Equilateral\n");
    }
    else if (a == b || b == c || a <= c) {
        printf("Isosceles\n");
    }
    else{
        printf("Scalene\n");
    }
    return 0;
    }