#wyodrębnianie napisów
napis = input("")
print(napis[0]) #wyświetla literęo indeksie równym 0
print(napis[3])
print(napis[2], napis[6])
print(napis[2] + napis[6])
print(napis[4] + napis[5] + napis[6] + "a")
print(napis[3:6])
print(napis[0:5])
print(napis[::-1])
I3d5b2RyxJlibmlhbmllIG5hcGlzw7N3CgpuYXBpcyA9IGlucHV0KCIiKQoKcHJpbnQobmFwaXNbMF0pICN3ecWbd2lldGxhIGxpdGVyxJlvIGluZGVrc2llIHLDs3dueW0gMApwcmludChuYXBpc1szXSkKcHJpbnQobmFwaXNbMl0sIG5hcGlzWzZdKQpwcmludChuYXBpc1syXSArIG5hcGlzWzZdKQpwcmludChuYXBpc1s0XSArIG5hcGlzWzVdICsgbmFwaXNbNl0gKyAiYSIpCnByaW50KG5hcGlzWzM6Nl0pCnByaW50KG5hcGlzWzA6NV0pCnByaW50KG5hcGlzWzo6LTFdKQo=