first = int(input())
second = int(input())
max_pw = int(input())
A = 35
B = 64
x = 1
y = 1
for count in range(1, max_pw+1):
    print(f"{chr(A)}{chr(B)}{x}{y}{chr(B)}{chr(A)}", end="|")
    y += 1
    A += 1
    if A > 55:
        A = 35
    B += 1
    if B > 96:
        B = 64
    if y == (second + 1):
        x += 1
        y = 1
    if x == (first + 1):
        break