#include<stdio.h>
int main()
{
    inta,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\n");
    }else if (a == b || b == c || a == c){
        printf("Isosceles\n");
    }else {
        printf("Scalene\n");
    }
    return 0;
}