elevator 1124 - py

import math
while True:
    data = input().split()
    l = int(data[0])
    c = int(data[1])
    r1 = int(data[2])
    r2 = int(data[3])
    longest = max(l, c)
    hip = math.hypot(l, c)
    diam = r1 + r1 + r2 + r2
    if l == 0 and c == 0 and r1 == 0 and r2 == 0:
        break
    elif diam > longest and diam > hip:
        print("N")
    else:
        print("S")