import sys

while True:
    while True:
        c = sys.stdin.read(1)
        if c != ' ': break       # skip leading spaces
    while c != '' and c > ' ':
        sys.stdout.write(c)      # print non-spaces
        c = sys.stdin.read(1)
    while c != '' and c != '\n': # skip all trailing characters
        c = sys.stdin.read(1)
    if c == '': break            # stop at EOF
    sys.stdout.write(c)