print(len("How long is this string?"))

s = "nininininini"
print(s[0::2])
print(s[1::2])

s = "The last word is unnecessary."
print(s[:17])

print("kayak"[::-1])

s = "minezgurgfzeyurfuyfzeruygzeiruimum"
print(s[len(s)//2])

l = [1,'1',2,'2',3,'3']
lnumber = l[::2]
lchar = l[1::2]
n = int(lchar[0] + lchar[1] + lchar[2])
print(n)
print(type(n))

s = ""
for i in range(len(lchar)):
    s += lchar[i]
n = int(s)
print(n)
print(type(n))
print(int("".join(lchar)))

l = [1,'1',2,'2',3,'3']
while l:
    l.pop()
print(l)

cities = {
    "Paris": (49, 2),
    "Lisbon": (38, 9),
    "Madrid": (40, 3)
    }
print(cities)

cities["Berlin"] = (52, 13)

cities.pop("Lisbon")
print("Lisbon" in cities)

print("TRDTRUDUIHUIGYTYDYTD"[3:7])
print([1,2,3,4,5,7,7,5,25,8,2,54,321,4,5].pop())