#include<stdio.h>
int main() {
    int a, b, c;
    printf("Enter the three sides of the triangle (a, b, c):");
    scanf("%d %d %d", &a, &b, &c);
    if (a < 0 || b < 0 || c < 0) {
        printf("Invalid Input\n");
    } else if (a == b && b == c || a == c ) {
        printf("Equilateral\n");
    } elseif (a == b || b== c || a == c) {
        printf("Isosceles\n");
    }else {
        printf("Scalene\n";)
    }
    return 0;