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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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    int n, m;
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    cin >> n >> m;
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    int a[n][m];
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    for (int i = 0; i < n; ++i) {
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        for (int j = 0; j < m; ++j) {
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            cin >> a[i][j];
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        }
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    }
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    for (int i = 1; i < n; i += 2) {
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        for (int j = 0; j < m; ++j) {
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            swap(a[i][j], a[i - 1][j]);
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        }
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    }
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    for (int i = 0; i < n; ++i) {
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        for (int j = 0; j < m; ++j) {
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            cout << a[i][j] << ' ';
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        }
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        cout << endl;
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    }
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    return 0;
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}