/Python/Codeforces 233 a solution python

Codeforces 233 a solution python

n=int(input())
m=n+1
if n%2!=0 :
    print("-1")
else :
    for i in range (1,m) :
        if i%2==0 :
            print(i-1)
        else :
            print(i+1)

Source: github.com

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