#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");
        return;
    }
    else if (a==b && b == c){
        printf("Equilateral");
    }
    else if (a==b || b==c || c == a){
        printf("Isosceles");
    }
    else{
        printf("Scalene");
    }
    
    return 0;
}