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