[zerojudge] d057: 11494 - Queen

import sys 

for s in sys.stdin:
    if(s == '0 0 0 0\n'): break
    x1, y1, x2, y2 = [int(z) for z in s.split()]
    m, n = abs(x1-x2), abs(y1-y2)
    r = 2
    if(m + n == 0): r = 0    # 同一點
    elif(m * n == 0): r = 1  # 同一軸
    elif(m == n): r = 1      # 同斜率
    print(r)