入力された文字列を区切り、n番目の単語を取得する
SCAN関数
str = scan(input_str, n, delimiter);
https://documentation.sas.com/doc/ja/pgmsascdc/v_061/ds2ref/p13adatt2vvhcxn1ext6w6eet24p.htm
str = scan(input_str, n, delimiter);
https://documentation.sas.com/doc/ja/pgmsascdc/v_061/ds2ref/p13adatt2vvhcxn1ext6w6eet24p.htm