- 100×100の全マスに、0~26の27種類をそれぞれ表示させるだけ
H, W = map(int, input().split())
chars = '.ABCDEFGHIJKLMNOPQRSTUVWXYZ'
for i in range(H):
ans_L = []
row_L = list(map(int, input().split()))
for num in row_L:
ans_L.append(chars[num])
print(''.join(ans_L))