#include<stdio.h>
int main()
void ClassifyTriangle(int a, int b, int c) {
    if (a < 0 || b < 0 || c < 0) {
        printf("Invalid Input\n");
        return;
    } 
    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;
    scanf("%d %d %d", &a,&b,&c);
    classifyTriangle(a, b, c);
    return 0;
}