출처 | https://www.acmicpc.net/problem/5073
while(1):
arr = sorted(list(map(int,input().split())))
if arr[0] == arr[1] == arr[2] == 0:
break
if arr[0] + arr[1] <= arr[2]:
print("Invalid")
elif arr[0] == arr[1] == arr[2]:
print("Equilateral ")
elif arr[0] == arr[1] or arr[1] == arr[2] or arr[0] == arr[2]:
print("Isosceles")
else:
print("Scalene")