[백준] 5073

import sys
while True:
    a,b,c=map(int, sys.stdin.readline().split())
    if a==0 and b==0 and c==0: break
    elif (a+b+c -max(a,b,c)) <= max(a,b,c): print("Invalid")
    elif a==b and b==c: print("Equilateral")
    elif a==b or b==c or a==c:print("Isosceles")
    else : print("Scalene")