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