m=input()
n=list(m)
n[::2],n[1::2]=n[1::2],n[::2]
''.join(n)
print(*n,sep="")

ec0a4dbe698fe769b0287081378f42da689ac63e
<mask token>

<mask token>
"""""".join(n)
print(*n, sep='')

m = input()
n = list(m)
n[::2], n[1::2] = n[1::2], n[::2]
"""""".join(n)
print(*n, sep='')

m=input()
n=list(m)
n[::2],n[1::2]=n[1::2],n[::2]
''.join(n)
print(*n,sep="")
