Introduction to Python

Profound Academy

Course Status
1
Input and Output
2
Mastering I/O
3
Variables and Integer Arithmetic
4
Mastering Variables
5
Conditional Operators
6
More on Boolean Variables
7
Advanced Conditions - Nesting
8
Mastering Conditions
9
Types and Variables
10
Mastering types
11
Strings
12
More Strings
13
Lists and ranges
14
Mastering Lists and ranges
15
For Loops
16
Mastering For loops
17
While Loops
18
continue, break, while...else, for...else
19
String and List methods
20
Nested Loops
21
Mastering Loops
22
List Comprehension
23
Advanced loops
24
Tuples and Sets
25
dict
26
Functions
27
Functions 2
28
Lambda and higher-order functions
29
Files

Only letters

Given a long text, you are asked to filter out and print only the letters.

The input contains a single line of text.

The program should print only the letters from that text.

Input	Output
I was born on 1997, April 29.	IwasbornonApril

Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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