a = int(input())
b = int(input())
max_passes = int(input())

is_greater_than_AB = False
is_greater_than_counter = False

passes_counter = 0
A = 35
B = 64
#for A in range(35, 55 + 1):
#    if is_greater_than_AB or is_greater_than_counter:
#        break
#    for B in range(64, 96 + 1):
#        if is_greater_than_AB or is_greater_than_counter:
#            break
for x in range(1, a + 1):
    if is_greater_than_AB or is_greater_than_counter:
         break
    for y in range(1, b + 1):

      passes_counter += 1
      print(f"{chr(A)}{chr(B)}{x}{y}{chr(B)}{chr(A)}|", end="")
      if passes_counter > (a + b):
          is_greater_than_AB = True
          break
      elif passes_counter >= max_passes:
        is_greater_than_counter = True
        break
      A += 1
      B += 1

      if A > 55:
          A = 35

      if B > 96:
          B = 64