#include <stdio.h>
int main() {
    int a, b, c;
    printf("Enter the lengths of the three sides of the triangle: ");
    scanf("%d %d %d", &a, &b, &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");
    }
    return 0;
}