write aprogram to read number from left to right 1234 1 2 3 4

def solve(n):
        if n < 3 :
                return -1 
        elif n%4 == 1 or n%4 == 3 :
                return 2
        elif n%4 == 0 :
                return 3
        else:
                return 4

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My simple solution in Python3

def solve(n):
    if n % 2==1:
        return 2
    n -= 4
    if n % 4 ==0 :
        return 3
    return 4

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