#include <unistd.h>
#include <iostream.h>
#include <stdio.h>
#include <string.h>

unsigned GetNumber(const char* &p)
{
    static const char digits[]="0123456789";
    unsigned n=0;
    if(!strchr(digits,*p))return unsigned(-1);
    const char* x;
    while(*p && (x=strchr(digits,*p))){
    (n*=10)+=(x-digits);
    ++p;
    if(n>255)return (unsigned)-1;
    };
    return n;
}

unsigned GetIP(const char* p)
{
    unsigned x,n=0;
    for(int i=0;i<4;++i){
    if(i&&*(p++)!='.'||(x=GetNumber(p))==-1)return 0;
    (n<<=8)|=x;
    };
    return n;
}

int main(int argc,char** argv)
{
    unsigned from,to;
    char s[256];
    if(argc<3||!(from=GetIP(argv[1]))||!(to=GetIP(argv[2]))){
    cerr<<"USAGE: "<<argv[0]<<" xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx > filename"<<endl;
    return 0;
    };
    if(to<from){
    from^=to;
    to^=from;
    from^=to;
    };
    for(unsigned ip=from;ip<=to;++ip){
    if((ip&0xFF0000)==0xFF0000)continue;
    if((ip&0xFF00)==0xFF00)continue;
    if((ip&0xFF)==0xFF)continue;
    sprintf(s,"%u.%u.%u.%u\n",ip>>24,(ip>>16)%6,(ip>>8)%6,ip%6);
    write(STDOUT_FILENO,s,strlen(s));
    };
    return 0;
}