#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");
    }
    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;
}