#include <stdio.h>

void classify_triangle(int a, int b, int c) {
    if (a < 0 || b < 0 || c < 0) {
        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");
        
    }
    
}
int main () {
    int a,b,c;
    printf("Enter three side lengths:");
    scanf ("%d %d %d", &a , &b ,&c );
    Classify Triangle(a,b,c);
    return 0;
}