Problem
Given a matrix of size N x M, print its transpose.
Input (from file `input.txt`):
- First line: Two integers N and M (1 ≤ N, M ≤ 20)
- Next N lines: M space-separated integers
Output (to file `output.txt`):
- M lines: each with N space-separated integers (the transposed matrix)
Example
input.txt:
2 3
1 2 3
4 5 6
output.txt:
1 4
2 5
3 6
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