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