Coding Challenge March 19

Problem 2 in python language 

1. n, m = map(int, input().split())
2. a = [input() for i in range(n)]
3.  
4. ans = ''
5. for i in range(n):
6. for j in range(m):
7. if a[i].count(a[i][j]) == 1 and ''.join(a[k][j] for k in range(n)).count(a[i][j]) == 1:
8. ans += a[i][j]
9.  
10. print(ans)