A = int(input())
B = int(input())
max_passwords_count = int(input())

flag = False
passwords_count = 0
while passwords_count < max_passwords_count:
    for a in range(35, 56):
        if a == 55:
            a = 35
        for b in range(64, 97):
            if b == 96:
                b = 64
            for x in range(1, A + 1):
                for y in range(1, B + 1):
                    print(f"{chr(a)}{chr(b)}{x}{y}{chr(b)}{chr(a)}", end="|")
                    a += 1
                    b += 1
                    x += 1
                    y += 1
                    passwords_count += 1
                    flag = True
                    break
            if flag:
                break
        if flag:
            break
    if flag:
        break