#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 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;
}