An algorithm is shown in the pseudo-code below:
1 cities ← ['Tokyo', 'Paris']
2 city1 ← 'Berlin'
3 city2 ← 'London'
4 OUTPUT city2
5 OUTPUT LEN(cities)
6 part ← SUBSTRING(0, 4, city1)
7 OUTPUT part
Note: SUBSTRING(start, length, string) extracts a section of a string starting at index start (where the first character is at index 0) for the given character length.
State the output of line 7 from this algorithm.