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#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
long long m, n, index = 0, sum = 0, i = 0, j = 0, num = 0;
char arr[1000];
string x;
cin >> m >> n >> x;
for (int i = x.length() - 1;i >= 0;i--) {
if (x[i] >= '0' && x[i] <= '9') {
num = x[i] - '0';
}
else if (x[i] >= 'A' && x[i] <= 'Z') {
num = x[i] - 'A' + 10;
}
else if (x[i] >= 'a' && x[i] <= 'z') {
 ...
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