Pythonista 3 cannot recognize line breaks

Question

import sys

print(sys.stdin.readline())

1
2
3

When I run the code above with the values above on pythonista 3, it doesn’t recognize line breaks and the output appears as follows

1
2
3

I expected the result to be like below

1

But readline() didn’t recognize line break and get ‘1\n2\n3’

How can I solve this problem?