#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\n");
    }
    else 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;
}