Go: package main

import (
	"bytes"
	"fmt"
)

//Ktai has a keyboard and a state.
type Ktai struct {
	keyboard KeyBoard
	textBuf  *bytes.Buffer
}

// KeyBoard is type of a map.
type KeyBoard map[rune]string

// KEYBOARD that Ktai has
var KEYBOARD = KeyBoard{
	'0': "",
	'1': ".,!? ",
	'2': "abc",
	'3': "def",
	'4': "ghi",
	'5': "jkl",
	'6': "mno",
	'7': "pqrs",
	'8': "tuv",
	'9': "wxyz",
}

func main() {
	var N int
	fmt.Scanf("%d", &N)
	ktai := &Ktai{
		KEYBOARD, &bytes.Buffer{},
	}
	for i := 0; i < N; i++ {
		var numstr string
		fmt.Scanf("%s", &numstr)
		ktai.feed(numstr)
		ktai.print()
	}
}

func (ktai *Ktai) feed(str string) {
	var char *byte
	for _, v := range str {
		if v == '0' {
			if char != nil {
				ktai.textBuf.WriteByte(*char)
				char = nil
			}
			continue
		} else {
			runestring := ktai.keyboard[v]
			idx := ktai.indexOf(char, runestring)
			next := (idx + 1) % len(runestring)
			c := runestring[next]
			char = &c
		}
	}
}

func (ktai *Ktai) indexOf(ch *byte, str string) int {
	if ch == nil {
		return -1
	}
	r := rune(*ch)
	idx := -1
	for i, v := range str {
		if r == v {
			idx = i
			break
		}
	}
	return idx
}

func (ktai *Ktai) print() {
	fmt.Println(ktai.textBuf.String())
	ktai.textBuf.Reset()
}

C++: #include <bits/stdc++.h>
using namespace std;

#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for(int i = 0;i < (n);i++)
#define FOR(i, a, b) for(int i = (a);i < (b);i++)
#define all(x) x.begin(),x.end()
#define fs first
#define sc second

using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;

const double eps = 1e-6;

template<typename A, typename B>inline void chmin(A &a, B b){if(a > b) a = b;}
template<typename A, typename B>inline void chmax(A &a, B b){if(a < b) a = b;}

const int64 mod = 1e9+7;

vector<string> key({".,!? ", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"});

int main(void){
	int32 n, m;
	cin >> n;
	REP(_, n){
		string s, res = "";
		cin >> s;
		int32 now = -1, in = 0;
		REP(i, s.size()){
			if(now == -1 && s[i] == '0') continue;
			if(s[i] == '0'){
				res += key[now][in];
				now = -1; in = 0;
			}
			else if(now == -1) now = s[i]-'1';
			else{
				in=(in+1)%key[now].size();
			}
		}
		cout << res << endl;
	}
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <string>

using namespace std;

int main(){
	vector<string> button;
	button.push_back(".,!? ");
	button.push_back("abc");
	button.push_back("def");
	button.push_back("ghi");
	button.push_back("jkl");
	button.push_back("mno");
	button.push_back("pqrs");
	button.push_back("tuv");
	button.push_back("wxyz");

	int n;
	cin >> n;
	for (int i = 0; i < n; i++){
		string s;
		string ret;
		cin >> s;
		char current = s[0];
		int count = 0;
		for (int unsigned i = 0; i < s.size(); i++){
			if (s[i] == '0'){
				if (count == 0) continue;
 				int it = (int)(current - '0') - 1;
				cout << button[it][(count -1) % button[it].size()];
				count = 0;
			}
			else {
				current = s[i];
				count++;
			}
		}
		cout << endl;
	}
	return 0;
}

C++: // warm heart, wagging tail,and a smile just for you!
//                                                                     ███████████
//                                                                   ███╬╬╬╬╬╬╬╬╬╬███
//                                                                ███╬╬╬╬╬████╬╬╬╬╬╬███
//                                            ███████████       ██╬╬╬╬╬████╬╬████╬╬╬╬╬██
//                                      █████████╬╬╬╬╬████████████╬╬╬╬╬██╬╬╬╬╬╬███╬╬╬╬╬██
//                               ████████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████████╬╬╬╬╬╬██╬╬╬╬╬╬╬██
//                             ████╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████████╬╬╬╬╬╬╬╬╬╬╬██
//                           ███╬╬╬█╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬███╬╬╬╬╬╬╬█████
//                         ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬████████╬╬╬╬╬██
//                       ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬╬╬╬╬╬███
//                     ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬██
//                 ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬████
//     █████████████╬╬╬╬╬╬╬╬██╬╬╬╬╬████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬██████
//   ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬██████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████╬╬╬╬╬╬╬███████████╬╬╬╬╬╬╬╬██╬╬╬██╬╬╬██
// ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬╬╬╬╬╬╬█╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬██
// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬▓▓▓▓▓▓╬╬╬████╬╬████╬╬╬╬╬╬╬▓▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬███
// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████▓▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬█████
// ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████████
//   ███╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██
//       ██████████████  ████╬╬╬╬╬╬███████████████████████████╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████
//                         ███████                           █████  ███████████████████
#include "bits/stdc++.h"
using namespace std;
#define MOD 1000000007
//#define MOD 998244353
const double EPS = 1e-9;
#define INF (1LL<<60)
#define D double
#define fs first
#define sc second
#define int long long
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i = (b-1);i>=(a);i--)
#define REP(i,n)  FOR(i,0,(n))
#define RREP(i,n) RFOR(i,0,(n))
#define ITR(itr,mp) for(auto itr = (mp).begin(); itr != (mp).end(); ++itr)
#define RITR(itr,mp) for(auto itr = (mp).rbegin(); itr != (mp).rend(); ++itr)
#define range(i,a,b) ((a)<=(i) && (i)<(b))
#define debug(x)  cout << #x << " = " << (x) << endl;
#define SP << " " << 
typedef pair<int,int> P;
typedef vector<vector<P> > Graph;
typedef vector<int> vec;
typedef vector<vector<int>> mat;


void solve(){
  string s;
  cin >> s;
  vector<char> c[10];
  c[1] = {'.',',','!','?',' '};
  c[2] = {'a','b','c'};
  c[3] = {'d','e','f'};
  c[4] = {'g','h','i'};
  c[5] = {'j','k','l'};
  c[6] = {'m','n','o'};
  c[7] = {'p','q','r','s'};
  c[8] = {'t','u','v'};
  c[9] = {'w','x','y','z'};

  string ans;
  int cnt = 0;
  REP(i,s.size()){
    if(s[i] != '0') cnt++;
    else{
      if(cnt) ans += c[s[i-1]-'0'][(cnt-1)%c[s[i-1]-'0'].size()];
      cnt = 0;
    }
  }

  cout << ans << endl;

}

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

  int q; cin >> q;
  while(q--) solve();
  //while(cin >> x >> y >> s, x) solve();

  return 0;
}

C++: #include<iostream>
#include<cmath>
#include<vector>
#include<string>
#include<cstring>
#include<cstdlib>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define rep(i,a) loop(i,0,a)
using namespace std;

char button1[5]={'.',',','!','?',' '};
char button2[3]={'a','b','c'};
char button3[3]={'d','e','f'};
char button4[3]={'g','h','i'};
char button5[3]={'j','k','l'};
char button6[3]={'m','n','o'};
char button7[4]={'p','q','r','s'};
char button8[3]={'t','u','v'};
char button9[4]={'w','x','y','z'};

int main(){
	string s;
	int n;
	cin>>n;
	cin.ignore();
	rep(a,n){
		getline(cin,s);
		int counta=0;
		string ans="";
		for(int i=0;i<s.size();i++){
			if(s[i]!='0'){
				counta=i;
				while(s[i]!='0' && i<s.size())i++;
				switch(s[counta]){
					case '1':
						ans+=button1[(i-counta-1)%5];
					break;
					case '2':
						ans+=button2[(i-counta-1)%3];
					break;
					case '3':
						ans+=button3[(i-counta-1)%3];
					break;
					case '4':
						ans+=button4[(i-counta-1)%3];
					break;
					case '5':
						ans+=button5[(i-counta-1)%3];
					break;
					case '6':
						ans+=button6[(i-counta-1)%3];
					break;
					case '7':
						ans+=button7[(i-counta-1)%4];
					break;
					case '8':
						ans+=button8[(i-counta-1)%3];
					break;
					case '9':
						ans+=button9[(i-counta-1)%4];
					break;
					default:
					break;
				}
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}