#include <iostream>
using namespace std;
int main() {
// int arr[]={1,2,3,4,5,6,7,8,9};
// int ok[]={2,4,6,8,10,12,14,16,18};
// int n=sizeof(arr)/sizeof(arr[0]);
// int m =sizeof(ok)/sizeof(ok[0]);
// int even=0,odd=0,max=0;
// for(int i=0;i<n;i++){
// if(arr[i]%2==0){
// even+=arr[i];
// }else{
// odd+=arr[i];
// }
// }
// for(int i=1;i<=n;i++){
// if(i%2==0){
// even+=arr[i-1];
// }
// else{
// odd+=arr[i-1];
// }
// }
// cout<<"even "<<even<<"odd "<<odd;
// for(int i=0;i<n;i++){
// for(int j=i+1;j<n;j++){
// cout<<"("<<arr[i]<<","<<arr[j]<<")"<<"--->"<<arr[i]+arr[j]<<endl;
// }
// }
// for(int i=0;i<n;i++){
// for(int j=0;j<m;j++){
// cout<<"("<<arr[i]<<","<<ok[j]<<")"<<"--->"<<arr[i]+ok[j]<<endl;
// }
// }
// for(int i=0;i<n;i++){
// for(int j=0;j<m;j++){
// if(arr[i]+ok[j]>max){
// max=arr[i]+ok[j];
// }
// }
// }
// cout<<max;
//prime number
// int n1,total=0;cin>>n1;
// for(int i=2;i<(n1/2)+1;i++){
// if(n1%i==0){
// total++;
// cout<<n1<<" is divisible by "<<i<<endl;
// }
// }
// if(total==0){
// cout<<n1<<" is prime number.";
// }
//prime number in a range
// int n,total; cin>>n;
// for(int i=2;i<n;i++){
// total=0;
// for(int j=2;j<(i/2)+1;j++){
// if(i%j==0){
// // cout<<i<<" is divisible by "<<j<<endl;
// // cout<<i<<" ";
// total++;
// }
// }
// if(total==0){
// cout<<i<<" ";
// }
// }
//reverse number and take sum
int n , m , sum=0; cin>>n>>m;
if(n<m && n>0){
for(int i=n;i<=m;i++){
int num=i%10;
if(num!=0){
}
int new_num=num*10
}
}
return 0;
}
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