asa

#include <iostream>

using namespace std;

int main()
{
    char a[256]="w234b5br6779"
    int n=strlen(a);
    for(int i=0;i<n-1;i++)
      if(a[i]>='0' && a[i]<='9' && a[i+1]>='0' && a[i+1]<='9')
      cout<<a[i]<<a[i+1];
    return 0;
}