6325 번 : Definite Values 
 6325 번 
 6325 번 - Definite Values 
 could print any number . But even in languages such as Pascal , where all values are initialized to zero , it is useful to give variables definite values before using them , to avoid side effects when your code portion is placed into a different context . 
 Assume that before the execution of the given program part , variable a has some definite value , while all other variables are undefined . You have to print the names of the variables which have a definite value after the execution of the program part . More specifically , format your output as follows . 
 For each program part in the input , first print the number of the program , as shown in the sample output . Then print a line containing the names of the variables which have a definite value after the execution of the given program part . Print them in alphabetically sorted order , and leave one blank after each variable name . If none of the variables has a definite value after the execution of the program part , print the word “ none ” . 
 PE 번