from lib import Grid2D, LETTERS_UPPER, add2, sub2


def part_1(data):
    g = Grid2D(data)
    g.print()

    current = None
    for c in range(g.n_cols):
        if g[(0, c)] == "|":
            current = (0, c)

    current_dir = Grid2D.S
    letters = ""
    done = False
    steps = 0

    while not done:
        while g[current] != " ":
            current = add2(current, current_dir)
            steps += 1
            if g[current] in LETTERS_UPPER:
                letter = g[current]
                if letter in letters:
                    done = True
                    break
                letters += letter

            if g[current] == "+":
                break

        next_field = None
        for nb in g.neighbors_ort(current):
            if nb != sub2(current, current_dir) and (g[nb] in "-|" or g[nb] in LETTERS_UPPER):
                next_field = nb
        if next_field is None:
            done = True
        else:
            current_dir = sub2(next_field, current)
    print(letters)
    print(steps)


def main():
    data = open(0).read()
    part_1(data)


if __name__ == "__main__":
    main()