import sys

BEFORE = 1;  INSIDE = 2;  AFTER  = 3  # states

state = BEFORE

while True:
    c = sys.stdin.read(1)
    if '' == c: break  # end of file
    if   (state == BEFORE):
        if (c != ' '):
            state = INSIDE
            sys.stdout.write(c)
    elif (state == INSIDE):
        if   c == ' ' :
            state = AFTER
        else:
            if c == '\n': state = BEFORE
            sys.stdout.write(c)
    elif (state == AFTER):
        if c == '\n':
            state = BEFORE
            sys.stdout.write(c)