import sys

NL = 0;  SP = 1;  OTHER = 2;  EOF = 3  # character types

char_to_type = { '' : EOF, '\n' : NL, ' ' : SP }

BEFORE = 0;  INSIDE = 1;  AFTER = 2;  END = 3  # FSM states

transitions = [
#             NL                SP                 OTHER           EOF
    [ [ BEFORE, True ], [ BEFORE, False ], [ INSIDE, True  ], [ END, False ] ], # BEFORE
    [ [ BEFORE, True ], [ AFTER,  False ], [ INSIDE, True  ], [ END, False ] ], # INSIDE
    [ [ BEFORE, True ], [ AFTER,  False ], [ AFTER,  False ], [ END, False ] ], # AFTER
]

state = BEFORE

while state != END:
    c = sys.stdin.read(1)
    ctype = char_to_type[c] if c in char_to_type else OTHER
    nextState, printChar = transitions[state][ctype]
    if printChar: sys.stdout.write(c)
    state = nextState