#include <stdio.h>
void determineTriangleType(int A, int B, int C) {
    if (A + B <= C || A + C <= B || B + C <= A) {
        printf("Not a triangle\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);
    determineTriangleType(A, B, C);
    return 0;
}