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