target_sum = int(input())

lst = input().split()

numbers = [int(i) for i in lst]

is_equal = False
for i in range(len(numbers)):
    for j in range(i+1, len(numbers)):
        output = ''

        if numbers[i] + numbers[j] == target_sum:
            is_equal = True
            output += str(numbers[i]) + ',' + str(numbers[j])
            print(output)


if is_equal is False:
    print('no pairs')