import re

text = input()

ats = re.findall('@\w+@@\w+@', text)
hashs = re.findall('#\w+##\w+#', text)
cond_list = ats + hashs
if len(cond_list) == 0:
    print('No word pairs found!')
else:
    for i in cond_list:
        if '_' in i or len(i.replace('@', '').replace('#', '')) < 6:
            cond_list.remove(i)
    print(f'{len(cond_list)} word pairs found!')
    mirror_words = []
    for i in cond_list:
        words = i.replace('@', '').replace('#', '')
        if words[:len(words)] == words[-1:len(words)]:
            mirror_words.append(f'{words[:len(words)]} <=> {words[-1:len(words)]}')
    if len(mirror_words) == 0:
        print("No mirror words!")
    else:
        print(f""""The mirror words are:
{', '.join(mirror_words)}
""")