#include<stdio.h>
int main()
{
    int a, b, c,; 
    scanf("%d %d %d", &a, &b, &c);
    if (a<=0 || b<=0 || c<=0 || a>100 || b>=100 || c>100){
        printf("Invalid Input\n");
    }
    else if((a+b<=c) || (a+c<=b) || (b=c<=a)){
        printf("Invalid input\n");
    }
    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;
}