// editor2
#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");
        
    }
    else if(a == b || b == c ){
        printf("Equilateral");
        
    }
    else if(a==b||)
    {
        printf("Isosceles");
    }
    else 
    {
        printf("Scalene");
    }
}