#include<stdio.h>
int main(){
    int n1,n2,n3;
    scanf("%d%d%d",&n1,&n2,&n3);
    
    if(n1+n2<n3 || n2+n3<n1 || n1+n3<n2){
        if(n1==n2 || n2==n1 || n1==n3){
            printf("Equilateral");
        }
        else if(n1 == n2 && n2 != n3 || n2 == n3 &&  n3 !=n1 || n1 == n3 && n1 != n2){
            printf("Isosceles");
        }
        else if(n1 != n2 != n3){
            printf("Scalene");
        }
        else{
            printf("Invalid input");
        }
    else{
        printf("Invalid input");
    }
    return 0;
}