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#include <iostream> using namespace std; int main(int argc, char** argv) {     int n;     cin>>n;     char a[n];     int b;     for(int i=0;i<n;i++){         cin>>a[i];         if(a[i]<=57&&a[i]>=48){             b=0;         }else{             b=1;         }         switch(b){             case 0 : cout<<a[i];             break;         }     }                           return 0; }