#include<stdio.h>
int triangle(int a,int b,int c){
    if(a=b=c){
        printf("Equilateral");
    }
    else if(a=b||a=c||(b=c)){
        printf("Isoscsles");
    }else{
        printf("Invalid Input");
    }
}
int main(){
    int a,b,c;
    scanf("%d %d %d ",&a,&b,&c);
    triangle(a,b,c);
}