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)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)Copyright © 2021 Codeinu
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