Password

def solve(n, data):
    n = int(n)
    pairs = str(data).strip().split(',')
    changed = []
    for pair in pairs[:n]:
        parts = pair.split()
        name, pwd = parts[0], parts[1]
        new_pwd = ''
        for c in pwd:
            if c == '1': new_pwd += '@'
            elif c == '0': new_pwd += '%'
            elif c == 'l': new_pwd += 'L'
            elif c == 'O': new_pwd += 'o'
            else: new_pwd += c
        if new_pwd != pwd:
            changed.append(f'{name} {new_pwd}')
    if not changed:
        print('There are no changes.')
    else:
        print(len(changed))
        for c in changed:
            print(c)