#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\n");
    }
    else if(a + b <= c || a + c <= b || b + c <= a){
        printf("Invalid input\n");
    }
    else if(a == b && == c){
        printf("Equilateral\n");
    }
    else if(a == b || b == c || a == c){
        printf("Isosceles\n");
        
    }
    else{
        printf("Scalene\n");
    }
    return 0;
}