SP3884 WHEN - When (You Believe)

It's said: there can be miracles, when you believe. The following programming language shows the power of "when". It has a very simple (case insensitive) grammar, shown below: ``` PROGRAM := WHEN | PROGRAM WHEN WHEN := 'when ' EXPRESSION STATEMENTS 'end when' STATEMENTS := STATEMENT | STATEMENTS STATEMENT STATEMENT := PRINT | SET PRINT := 'print ' EXPRESSION_LIST SET := 'set ' ASSIGNMENT_LIST EXPRESSION_LIST := EXPRESSION | EXPRESSION_LIST ',' EXPRESSION ASSIGNMENT_LIST := ASSIGNMENT | ASSIGNMENT_LIST ',' ASSIGNMENT ASSIGNMENT := VARIABLE '=' EXPRESSION EXPRESSION := '(' EXPRESSION OP EXPRESSION ')' | VARIABLE | NUMBER OP := '

The input consists of a single syntactically correct program. You may assume that the program will not execute more than 100000 set statements and 100000 print statements.

Print the output produced by executing the given program. Both the input and output file will not exceed 100KB.