CREATE TABLE table_name_72 (length__m_ INTEGER, country VARCHAR(255), maximum_grade___percentage_ VARCHAR(255), vertical_drop__m_ VARCHAR(255))
What is the shortest length of a track in Norway that has a maximum grade of 15% and a vertical drop less than 122.22 m?
    
SQL: SELECT MIN(length__m_) FROM table_name_72 WHERE maximum_grade___percentage_ = "15" AND vertical_drop__m_ < 122.22 AND country = "norway"