void OnStart()
{

   //---      
   string pairs[];      
   int length = getAvailableCurrencyPairs(pairs);     
   for(int i=0; i < length; i++)     
   {         

     Alert("Pair #", i+1, ": ", pairs[i]);      } 
   }

   //+------------------------------------------------------------------+
int getAvailableCurrencyPairs(string& availableCurrencyPairs[])
{//---      
bool selected = false;   
const int symbolsCount = SymbolsTotal(selected);   
int currencypairsCount;   
ArrayResize(availableCurrencyPairs, symbolsCount);  
 int idxCurrencyPair = 0;   
for(int idxSymbol = 0; idxSymbol < symbolsCount; idxSymbol++)    
 {               
string symbol = SymbolName(idxSymbol, selected);         
string firstChar = StringSubstr(symbol, 0, 1);         
   if(firstChar != "#" && StringLen(symbol) == 6)           
   {                       
      availableCurrencyPairs[idxCurrencyPair++] = symbol;            
   }      
}     
currencypairsCount = idxCurrencyPair;

ArrayResize(availableCurrencyPairs, currencypairsCount);     

return currencypairsCount;
}

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