Go: // Keitai Message
// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=2006&lang=jp
package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var table = []string{
	"",
	".,!? ",
	"abc",
	"def",
	"ghi",
	"jkl",
	"mno",
	"pqrs",
	"tuv",
	"wxyz",
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	n := nextInt(sc)

	for i := 0; i < n; i++ {
		message := nextString(sc)
		currentButton, count := 0, 0
		for _, word := range message {
			// 確定の処理を書く
			if word == '0' {
				if currentButton == 0 {
					count = 0
					continue
				}
				mod := len(table[currentButton])
				tmp := table[currentButton][(count-1)%mod]
				currentButton, count = 0, 0
				fmt.Printf("%c", tmp)
			} else {
				count++
				currentButton = int(word) - 48 // '0'はASCIIで48
			}
		}
		fmt.Println()
	}
}

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, err := strconv.Atoi(sc.Text())
	if err != nil {
		panic(err)
	}
	return i
}

func nextString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <algorithm>
#include <cctype>
#include <cstdio>
#include <iostream>
#include <locale>
#include <numeric>
#include <string>
#include <vector>

using namespace std;

string solve(string s){
    int count=0;
    string ans;
    char keep;
    string keeps;
    char c;
    for(int i=0;i<s.size();i++){
        // char k=s[i];
        if(s[i]!='0'){
            count++;
            c=s[i];
        }
        else{
                if(c== '2'){
                    if(count%3==1)ans.append(1,'a');
                    else if(count%3==2)ans.append(1,'b');
                    else ans.append(1,'c');
                }
                else if(c== '3'){
                    if(count%3==1)ans.append(1,'d');
                    else if(count%3==2)ans.append(1,'e');
                    else ans.append(1,'f');
                }
                else if(c== '4'){
                    if(count%3==1)ans.append(1,'g');
                    else if(count%3==2)ans.append(1,'h');
                    else ans.append(1,'i');
                }
                else if(c== '5'){
                    if(count%3==1)ans.append(1,'j');
                    else if(count%3==2)ans.append(1,'k');
                    else ans.append(1,'l');
                }
                else if(c== '6'){
                    if(count%3==1)ans.append(1,'m');
                    else if(count%3==2)ans.append(1,'n');
                    else ans.append(1,'o');
                }
                else if(c== '7'){
                    if(count%4==1)ans.append(1,'p');
                    else if(count%4==2)ans.append(1,'q');
                    else if(count%4==3)ans.append(1,'r');
                    else ans.append(1,'s');
                }
                else if(c== '8'){
                    if(count%3==1)ans.append(1,'t');
                    else if(count%3==2)ans.append(1,'u');
                    else ans.append(1,'v');
                }
                else if(c== '9'){
                    if(count%4==1)ans.append(1,'w');
                    else if(count%4==2)ans.append(1,'x');
                    else if(count%4==3)ans.append(1,'y');
                    else ans.append(1,'z');
                }
                else if(c== '1'){
                    if(count%4==1)ans.append(1,'.');
                    else if(count%4==2)ans.append(1,',');
                    else if(count%4==3)ans.append(1,'!');
                    else ans.append(1,'?');
                }
            count=0;
        }
    }
    // cout << ans << "%%%%%%%%%%%%%%%%"<<endl;
    return ans;
}

int main(int argc, char const *argv[]) {
    cin.tie(0);
    int n;
    cin >> n;
    string s;
    vector<string>ans;
    for(int i=0;i<n;i++){
        cin >> s;
        ans.push_back(solve(s));
    }
    for(int i=0;i<n;i++){
        cout << ans[i]<<endl;
    }
}

C++: #ifdef LOCAL
    #define _GLIBCXX_DEBUG
    #define __clock__
#else
    #pragma GCC optimize("Ofast")
#endif
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using VI = vector<ll>;
using VV = vector<VI>;
using VS = vector<string>;
using PII = pair<ll, ll>;

// tourist set
template <typename A, typename B>
string to_string(pair<A, B> p);

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);

string to_string(const string& s) {
  return '"' + s + '"';
}

string to_string(const char* s) {
  return to_string((string) s);
}

string to_string(bool b) {
  return (b ? "true" : "false");
}

string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}

template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) {
    res += static_cast<char>('0' + v[i]);
  }
  return res;
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}

void debug_out() { cerr << '\n'; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
// tourist set end

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define rep(i,b) FOR(i, 0, b)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<'\n'
#define p2(s, t) cout << (s) << " " << (t) << '\n'
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << '\n'
#define p_yes() p("YES")
#define p_no() p("NO")
#define SZ(x) ((int)(x).size())
#define SORT(A) sort(ALL(A))
#define RSORT(A) sort(ALL(A), greater<ll>())
#define MP make_pair

ll SUM(VI& V){
  return accumulate(ALL(V), 0LL);
}

void print_vector(VI& V){
  ll n = V.size();
  rep(i, n){
    if(i) cout << ' ';
    cout << V[i];
  }
  cout << endl;
}

ll gcd(ll a,ll b){
    if(b == 0) return a;
    return gcd(b,a%b);
}

ll lcm(ll a,ll b){
    ll g = gcd(a,b);
    return a / g * b;
}

void no(){p_no(); exit(0);}
void yes(){p_yes(); exit(0);}

const ll mod = 1e9 + 7;
const ll inf = 1e18;
const double PI = acos(-1);

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    map<ll, string> mp;
    mp[1] = ".,!? ";
    mp[2] = "abc";
    mp[3] = "def";
    mp[4] = "ghi";
    mp[5] = "jkl";
    mp[6] = "mno";
    mp[7] = "pqrs";
    mp[8] = "tuv";
    mp[9] = "wxyz";

    // input
    ll Q;cin>>Q;
    while(Q--){
      string s;cin>>s;
      ll L = s.size();
      ll cnt=0;
      ll last = 0;
      stringstream ss;
      rep(i,L){
        char c = s[i];
        ll v = c-'0';
        if(v==0){
          if(cnt==0)continue;
          ll idx = cnt-1;
          idx %= mp[last].size();
          ss << mp[last][idx];
          cnt=0;
        }else{
          cnt++;
        }
        last = v;
      }
      p(ss.str());
    }
    
    return 0;
}