TString s1_input_s2( TString &s1,  TString &s2)
{
    TString buff;
    int sz = strlen(s1.str) + strlen(s2.str)-2;
    buff = new char[sz + 1];
    buff.str[0]=sz;
    int poz=2;
    int i=0;
    int j=0;

    for( i = 1,j=0; i <poz,j<strlen(s1.str); i++,j++)
        {buff.str[i] = s1.str[i];buff.output();}

     for(i=poz,j=1;i<=strlen(s2.str),j<=strlen(s2.str);i++,j++)
        {buff.str[i] = s2.str[j];buff.output();}

     for(i=strlen(s2.str)+poz,j=poz+1;i<strlen(s1.str),j<strlen(s1.str)+poz;i++,j++)
        {buff.str[i]=s1.str[j];buff.output();}


return buff;
}