To get you started with B...

787.py

import fileinput


def solve(sequence):
    pass

def main():
    sequence = []
    for line in fileinput.input():
        for word in line.split():
            x = int(word)
            if x == -999999:
                res = solve(sequence)
                print(res)
                sequence = []
            else:
                sequence.append(x)


if __name__ == '__main__':
    main()