from __future__ import print_function
from collections import defaultdict
 
cups = defaultdict(set)
 
def add():
    for y in sorted(cups, reverse=True):
        for x in sorted(cups[y]):
            if x+1 in cups[y] and (y+1 not in cups or x not in cups[y+1]):
                cups[y+1].add(x)
                return
 
    x = 0
    while True:
        if x not in cups[0]:
            cups[0].add(x)
            return
 
        x += 1
 
def remove():
    for y in sorted(cups, reverse=True):
        cups[y].remove(min(cups[y]))
 
        if not cups[y]:
            del cups[y]
 
        return
 
def print_cups():
    for y, row in sorted(cups.items(), reverse=True):
        print(" "*y + " ".join(" A"[x in row] for x in range(max(row)+1)))
 
instructions = ""
 
try:
    input = raw_input
except NameError:
    pass
 
while True:
    try:
        line = input()
        if not line: break
        instructions += line
 
    except EOFError:
        break
 
a = None
r = None
 
for c in [x for x in instructions if ' ' <= x <= '~']:
    if a is None or c == a:
        add()
        a = c
 
    elif r is None or c == r:
        remove()
        r = c
 
print_cups()

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