Take the given sentence and detect out all the proper nouns
John, Paul and George went by train to London
The proper nouns in the given sentence are "John," "Paul," "George," and "London."
Complete the following task based on the instruction and optional input provided.### Instruction:
Take the given sentence and detect out all the proper nouns

### Input:
John, Paul and George went by train to London

### Output:
The proper nouns in the given sentence are "John," "Paul," "George," and "London."