email = "TerekhovFV@mpei.ru"
letters = ""

i=0
while i < len(email):
    char=email[i]
    if char == '@':
        break
    else:
        if char.isalpha():
            letters+=char
    i+=1

other_chars = email[i:]

print("Строка 1 (буквы):", letters)
print("Строка 2 (остальные символы):", other_chars)