let a=process.argv.slice(2),r='',l='',j=0,v=a.length>0?a[0]:[];
while(j<v.length){let f=true;
    l += v[j];
    a.forEach(s=>{
        if(!(s.includes(l))){f = false;}
    });
    if(f){r=l.length>r.length?l:r;}
    else{l=v[j];}
    ++j;
}
console.log(r);