命名那个数字

#include<iostream>
#include<algorithm>
#include<queue>
#include<stack>
#include<cstring>
#include<cstdio>
#include<cmath>
#include<iomanip>
using namespace std;
string s[5000],k[3*3*3*3*3*3*3*3*3*3*3*3+1];
string num,key[10]={"","","ABC","DEF","GHI","JKL","MNO","PRS","TUV","WXY"};
int cnt,flag;
void dfs(string num,string result)
{
    if(num.empty())
    {
        k[cnt++]=result;
        return ;
    }
    for(int i=0;i<3;i++)dfs(num.substr(1),result+key[num[0]-'0'][i]);
    return ;
}
int main()
{
    ios::sync_with_stdio(false);
    cin>>num;
    for(int i=1;i<=4617;i++)
    {
        cin>>s[i];
    }
    dfs(num,"");
    for(int i=0;i<cnt;i++)
    {
        if(*lower_bound(s+1,s+4618,k[i])==k[i])
        {
              cout<<*lower_bound(s+1,s+4618,k[i])<<endl;
            flag=1;
        }
    }
    if(!flag)cout<<"NONE"<<endl;
    return 0;
}