#include "iostream"
#include "cstdio"
#include "cmath"
#include "algorithm"
#include "string"
#include "vector"
using namespace std;
int main() {
int n, m;
cin >> n >> m;
char** x = new char*[n];
for (int i = 0; i < n; ++i) {
x[i] = new char[m];
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> x[i][j];
}
}char b = 'B', w = 'W',temp;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (x[i][j] == '.') {
if ((j + i) % 2 == 0) {
x[i][j] = 'B';
}
else x[i][j] = 'W';
}
}
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cout<< x[i][j];
}
cout << endl;
}
system("pause");
return 0;
}
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NTggOTcKLS0uLi4uLi4uLi4tLi4tLi4uLi4uLi4uLi4uLi4uLS4uLi4tLS4uLS4tLi0uLi0uLS4tLS0uLS4tLi4uLS4tLS4uLS4tLS0uLS4uLi4tLi4uLS4tLS0uLi0uLS4tLi4uLQouLS0tLi4uLi4uLi4tLS4uLi4uLi4uLi0tLS0tLS0tLi4uLS0uLi0tLi4uLS0uLS4uLi4tLS4tLi0tLi4tLS4uLS4uLi4uLS4uLi0uLS0uLS0uLi4uLi4uLS0uLi4uLS4tCi4tLi4uLS4tLS4tLi4tLS4uLS4uLS0tLi4tLi0uLi4uLS4uLi0uLi0uLi4uLS0uLi4tLi4uLi4tLi4uLS4tLi4uLS4tLS4tLi0uLS0tLi4tLS4uLi4uLi0uLi0uLi4tLi0KLS0uLi4uLi4uLS0uLi4uLi4tLi4uLi4uLi4tLi4uLi0uLi4tLS4uLS4tLi0uLi4uLS4tLS4uLi0tLi4uLS4tLi0tLi4tLi4tLS4uLi0tLi0uLi0uLi4uLS4uLi4uLS0uLgouLS0tLS0uLi0uLi4tLS4uLS4uLS4uLi0uLS4uLi0uLS4tLi0tLS4tLi4uLS0uLS4uLS0uLi4tLi4tLi4uLi4uLi4tLS0uLi4uLi4uLi4tLi0tLi4uLi4uLS4tLi4tLS4tCi0tLi4uLi4uLS4uLg==
58 97
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