1a = "¢пр"
2
3print(a[0], a[0:1])
4print(a[1], a[1:2])
5print(a[2], a[2:3])
6try:
7    print(a[3])
8except IndexError:
9    print("IndexError")
10print(a[3:4])
11
12print(a[-1])
13print(a[-2], a[-2:-1])
14print(a[-3], a[-3:-2])
15try:
16    print(a[-4])
17except IndexError:
18    print("IndexError")
19print(a[-4:-3])
20
21print(a[0:2])
22print(a[1:3])
23print(a[2:4])
24