A.py

from sys import stdin
from random import shuffle


def main():
    input = stdin.readline()
    n = int(input.split(' ')[0])
    f = int(input.split(' ')[1])

    indexes = [i for i in range(n)]
    shuffle(indexes)

    next_query = ''
    i = 0
    while i < n:

        if f == n:
            break
        if i == n - 1:
            print('%s%d\n' % (next_query, indexes[i] + 1))
            break
        j = i + 1
        print('%s%d %d\n' % (next_query, indexes[i] + 1, indexes[j] + 1))
        next_query = ''
        line = stdin.readline()
        if 'Accepted' in line:
            return
        f_new = int(line)
        if f_new - f == 2:
            f = f_new
            i = j + 1
            continue
        elif f_new - f == -2:
            next_query = '%d %d ' % (indexes[i] + 1, indexes[j] + 1)
            f = f_new + 2
            i = j + 1
            continue

        else:   # f_new - f can be only zero
            print ('%d\n' % (indexes[i] + 1))
            line = stdin.readline()
            if 'Accepted' in line:
                return
            f_new = int(line)
            if f_new - f == -1:
                next_query = '%d %d ' % (indexes[i] + 1, indexes[j] + 1)
                f = f_new + 1
            i = j + 1
            continue
    stdin.readline()
    return


if __name__ == '__main__':
    main()