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a,b=map(int,input().split()) c,d=map(int,input().split()) if (a==c and b==d): print(0) elif ((a+b)==(c+d)) or ((a-b)==(c-d)) or abs(a-c)+abs(b-d)<=3: print(1) elif (abs(a-c)+abs(b-d))<=6 or (abs((a+b)-(c+d))<=3) or (abs((a-b)-(c-d))<=3) or (a+b)%2==(c+d)%2: print(2) else: print(3)
https://ide.geeksforgeeks.org/st4LRuDhpG
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