_$_L_A_B_E_L = _I_N_I_T_I_A_L;
while (<_I_N_P_U_T>) {
    if (/:$/) {
	_$_L_A_B_E_L = $`;
    } else {
	print _O_U_T_P_U_T _$_L_A_B_E_L, _S_E_P, $_;
    }
}
