A30066.Student List for Course (25)

Zhejiang University has 40000 students and provides 2500 courses. Now given the registered course list of each student, you are supposed to output the student name lists of all the courses.

Each input file contains one test case. For each case, the first line contains 2 numbers: N ( <=40000), the total number of students, and K ( <=2500), the total number of courses. Then N lines follow, each contains a student's name (3 capital English lett

For each test case, print the student name lists of all the courses in increasing order of the course numbers. For each course, first print in one line the course number and the number of registered students, separated by a space. Then output the students