Problem
Given two strings A and B, print all common substrings of length 2, in lexicographical order, one per line. If none, print "None".
Input format
Input
input.txt
- String A (1–50) - String B (1–50)
Output format
Output
output.txt
- All common substrings of length 2 (one per line), or "None"
Example
input
ababc bcabc
output
ab bc
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Sample cases (from the problem)
Sample Case 1
Input
ababc bcabc
Expected output
ab bc
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