x = -1
asd = []
while x != 0:
      .....x = int(input("gir: "))
.....if x != 0:
.........asd.append(x)
print(min(asd))
print(max(asd))
print(sum(asd) / len(asd))

import string
# regex de kullanılabilirdi
a = input("gir: ").upper()
b = ""
for x in a:
....if x in string.ascii_uppercase:
........b += x
for i in range(0, len(b) - 3):
....print(b[i:i+4])