#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 ||b==c ||a==c){
        printf("Isosceles");
    }
    else{
        printf("scolene");
    }
    return 0;
}