2329：Nearest number - 2

Input is the matrix A of N by N non-negative integers.

A distance between two elements A_ij and A_pq is defined as |i − p| + |j − q|.

Your program must replace each zero element in the matrix with the nearest non-zero one. If there are two or more nearest non-zeroes, the zero must be left in place.
Constraints
1 ≤ N ≤ 200, 0 ≤ Ai ≤ 1000000

Input contains the number N followed by N² integers, representing the matrix row-by-row.

Output must contain N² integers, representing the modified matrix row-by-row.