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27 lines
627 B
C++
27 lines
627 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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char a[] = "BGR";
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const int N = 2e5 + 50;
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char str[N], ans[4];
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int main() {
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int n;
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scanf("%d%s", &n, str);
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int ansc = 0x3f3f3f3f;
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do {
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int cnt = 0;
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for (int i = 0; i < n; i++)
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if (str[i] != a[i % 3])
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cnt++;
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if (cnt < ansc)
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strcpy(ans, a), ansc = cnt;
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} while (next_permutation(a, a + 3));
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printf("%d\n", ansc);
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for (int i = 0; i < n; i++) putchar(ans[i % 3]);
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return 0;
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}
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