$6\mathrm{.}15$ LAB: Parsing dates

Complete main$()$ to read dates from input, one date per line. Each date's format must be as follows: March $1,1990.$ Any date not following that format is incorrect and should be ignored. Use the substring$()$ method to parse the string and extract the date. The input ends with $-1$ on a line alone. Output each correct date as: $3/1/1990.$

Ex: If the input is:

March $1,1990$

April $21995$

$7/15/20$

December $13,2003$

$-1$

then the output is:

$3/1/1990$

$12/13/2003$