The subroutine LOCATE finds the index of the first occurrence of a character in a string, using 0-based indexing.
For example, LOCATE('Database', 'a') would return 1.
Four variables are initialized as follows:
continent ← 'South America'
country ← 'Argentina'
capital ← 'Buenos Aires'
highlight ← 'Iguazu Falls'
The variable y is assigned a value using the statement:
y ← LOCATE(highlight, 'u')
What value is assigned to y?
222
333
555
−1-1−1