import sys
 
def read():
 
    ## Read
    output = []
    lines = sys.stdin.readlines()
    for line in lines:
        chars = {}
        for char in line:
            if char in chars:
                chars[char] += 1
            else:
                chars[char] = 1
        if 2 in chars.values():
            output.append(line)
 
    ## Write
    for line in output:
        print(line)
 
read()
 
## How to run it
# echo -e "asdf\nd fm\ndfaa\naaaa\naabb" | python basic_test.py

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

YXNkZgpmZGFzCmFzZHMKZCBmbQpkZmFhCmFhYWEKYWFiYgphYWFiYg==

asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb