C :

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

char map[]="222333444555666777888999";
char str[80],telNumbers[9];

void standardizeTel();
int main()
{
	int i,j;
	scanf("%s",str);
	standardizeTel();
	printf("%s",telNumbers);
	return 0;
}

void standardizeTel()
{
	int j,k;
	j=k=-1;
	while(k<8)
	{
		j++;
		if(str[j]=='-')
			continue;
		k++;
		if(k==3)
		{
			telNumbers[k]='-';
			k++;
		}
		if(str[j]>='A'&&str[j]<='Z')
		{
			telNumbers[k]=map[str[j]-'A'];
			continue;
		}
		telNumbers[k]=str[j];
	}
	telNumbers[k]='\0';
}

C++ :

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
using namespace std;
int main()
{
	string s;
	int s1[8];
	cin>>s;
	while(1)
	  {int m=1,k=1;
	  for(int i=0;i<=s.size();++i)
	    if(s[i]=='-'||s[i]=='Y'||s[i]=='Z')
	      {s.erase(i,1);m=0;}
	  for(int i=0;i<=s.size();++i)
	    if(s[i]=='-'||s[i]=='Y'||s[i]=='Z')
	      k=0;
	  if(k)
	    break;
	  }
	for(int i=0;i<=s.size();++i)
	  {
	  if(s[i]=='0')  s1[i]=0;
	  if(s[i]=='1')  s1[i]=1;
	  if(s[i]=='A'||s[i]=='B'||s[i]=='C'||s[i]=='2')  s1[i]=2;
	  if(s[i]=='D'||s[i]=='E'||s[i]=='F'||s[i]=='3')  s1[i]=3;
	  if(s[i]=='G'||s[i]=='H'||s[i]=='I'||s[i]=='4')  s1[i]=4;
	  if(s[i]=='J'||s[i]=='K'||s[i]=='L'||s[i]=='5')  s1[i]=5;
	  if(s[i]=='M'||s[i]=='N'||s[i]=='O'||s[i]=='6')  s1[i]=6;
	  if(s[i]=='P'||s[i]=='Q'||s[i]=='R'||s[i]=='7')  s1[i]=7;
	  if(s[i]=='S'||s[i]=='T'||s[i]=='U'||s[i]=='8')  s1[i]=8;
	  if(s[i]=='V'||s[i]=='W'||s[i]=='X'||s[i]=='9')  s1[i]=9;
	  }
	for(int i=0;i<=2;++i)
	  cout<<s1[i];
	cout<<"-";
	for(int i=3;i<=6;++i)
	  cout<<s1[i];
	return 0;
}