State the output of line 7 from the algorithm shown in Figure 1.

(Note: Assume string indexing begins at 0 and the substring function takes parameters in the format SUBSTRING(start_index, length, string)).

Figure 1

1  towns ← ['Belfast', 'Cardiff']
2  town1 ← 'Manchester'
3  town2 ← 'Bristol'
4  OUTPUT town1
5  OUTPUT LEN(towns)
6  part ← SUBSTRING(3, 4, town1)
7  OUTPUT part