/*
                                                                                                     
                                             `-:://:::-                                             
                                           `//:-------:/:`                                          
                                          .+:--.......--:+`                                         
                                         `+:--..`````..--//`                                        
                                         .o:--..`` ``..--:o`                                        
                                         .o:--...```..---+/`                                        
                                       `/y+o/---....---:+o.                                         
                                   `...````-os+/:---:/+o/--.`                                       
              `-/+++++/:.      `...`       :h+d+oooo+/+-`   ...                                     
            `/++//:::://++-`....`         -.`//````````:`     `..`                                  
           `o+/::------://o/`           `-` -.          -`       `..`                               
 `---.-o/:./o/::-..``..-ЗАПУСКАЕМ      ..  ..            -`        `...       ``..``                
  `....o+:-++/:--.```..-://s.        `-`  .-              -`          `-o: .-//::::/:-`             
          `:s+/:--....-::/+s-`      .-   `-                -`           -///:--------:/:`           
           ./s+//:::::://oo-``..НЕЙРОННУЮ: СЕТЬ:::::::-`РАБОТЯГИ        `+:--........--:/`          
            .:ooo+++++osso-`    `.:-...`/` ./::-------:/:`   -`         :+--..``````.--:+:...-+:-`  
             `.-/+++++/+-.-`    -.   ``:so:/:--.......--:+`  `-```````o+/+--..`````..--:o/-..:s+:.  
                 ```````:``.. `-`     -` `+:--..`````..--/+-.../.`````..-o:--.......---/o.    `     
                        `:  `:-      -.  .o:--..`` ``..--:o`   `-`      `:o+:--------:+o-`          
                         `-`-...    ..   .o/--...```..--:+/`    `-`     `oy/so/////++o/.`           
                          -/`  `-` `- ``+s/o/:---...---:++.      `-`   .-../d://///:-.`             
                `.---..``-..-    .-/..`````-oo+/:::::/+o+-        `-``-`  `-.  ````                 
             `:++++/+++++-  ..``.-/:`      /y-:/++o++/:.`..`       ./.   `-                         
            -++/::::::://+/..:-``:` ..   `-.`  ```.```    `..`   `..`-` `-                          
       ``  -o//:--....-::/++` -.-`   `-`.-`                 `..`..`  `-.-                           
  -----ss+:++/:--.```..-://s.  /.     `::                    `-:.     ./`                           
  `````/:..+o/::-..``.--:/+s. ..-`   `-``-`                 ..` `-`  `-`-`                          
          `-s+/::-----::/+oo---``-` ..    .:-    ```      .-`     .-.-  `-`                         
           `:oo+//::://+os/..:`..-/:`      :y.-:::::::.`.-`        ./-`  `-`                        
            `./+oooooooo+/.`-    .-:...`.. .//:-------://`        `- `..` `:.                       
              ``.-::::-.``-/`  `-` `-  `oo:+:--.......--:/`      `-    `.:--h.``..```               
                          -.-`.-    .-   `+:--..`````..--//`    `-       /s-//::::::::.             
                         -` `/-      ..  .o:--..`` ``..--:o.```.-        `//:--------://`           
                        -` .-`.-`     -.`-o/--...```..--:+/.``-:....``:-.+:--....`...--:+`          
                       ..`-.   `-.   ``:os:o/:---...---:++.  `-     ``///+:-..``````.--:+-````-.`   
              `.:///////.-`      .:-..` -``-+o+/:::::/+o/.  `-         `:+:-..`````..--:o/:--/ys+-  
            `-++///////+o/. ``....`-.    :` `.:++++++/:.`  .-           -o/---......---/o.   `.`    
           `++//:-----::/+o:..`     .-`   :    ```````    .-           `+so+:--------:++-`          
  `````:-``:o/::-..`..--:/+o`         -.  `-             .-          `../../+o+////+o+:.`           
  -----syo/o+/:--.```..-://s.          .-` `-           .-        `...     ``-:////:-``             
       .` `/s//:--....-::/+s.            -. `-`        .-       `..`                                
           .+o+/:::--:://+s/-..`          .::+y  ```  .-     `..`                                   
            ./oo++////+oso-`   `....       :y-+:::::::/`   ...                                      
             `.:+oooooo/-`         `....-. .//:-------:/:-.`                                        
                ``...``                 /+:+:--.......--:+`                                         
                                         `+:--..`````..--//`                                        
                                         .o:--..`` ``..--:o`                                        
                                         .+/--...```..--:+/`                                        
                                         `-o/:---...---:++.                                         
                                          `-+o+/:---:/+o/.                                          
                                            `.:+oooo+/-.`                                           
                                               ``````                                               
*/

#ifdef aimbot
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")
#endif

#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <map>
#include <set>
#include <queue>
#include <ostream>
#include <istream>
#include <typeinfo>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <limits>
#include <fstream>
#include <array>
#include <list>
#include <bitset>
#include <functional>
#include <random>
#include <cstring>
#include <chrono>

#define random escape__from__random__aetuhoetnuhshe
#define mt make_tuple
#define x first
#define y second
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define umap unordered_map
#define uset unordered_set
#define elif else if
#define len(v) ((int)v.size())
#define f(i, n) for (int i = 0; i < (n); i++)
#define rof(i, n) for (int i = ((n) - 1); i >= 0; i--)
#define apply(v, act) for (auto &x : v) { act; }
#define log(args...) {string s = #args;deque<string> deq;\
string buf = "";int bal = 0;for (char c : s) {\
if (c == '(' || c == '[' || c == '{') {bal++;\
} else if (c == ')' || c == ']' || c == '}') {\
bal--;} else {if (bal == 0) {if (c == ',') {\
deq.pb(buf);buf = "";} else {if (c != ' ') {\
buf += c;}}}}}if (!buf.empty()) {deq.pb(buf);}\
smart_io::precall_print();smart_io::_print(deq, args);}

inline int min(const int &x, const int &y) { return (((y-x)>>(32-1))&(x^y))^x; }
inline int max(const int &x, const int &y) { return (((y-x)>>(32-1))&(x^y))^y; }
inline long long min(const long long &x, const long long &y) { return (((y-x)>>(64-1))&(x^y))^x; }
inline long long max(const long long &x, const long long &y) { return (((y-x)>>(64-1))&(x^y))^y; }

#define print    \
smart_io::precall_print(); \
cout,

#define scan cin,

#ifdef fast_allocator
const int MAXMEM = 200 * 1000 * 1024;
char _memory[MAXMEM];
size_t _ptr = 0;
void* operator new(size_t _x) { _ptr += _x; assert(_ptr < MAXMEM); return _memory + _ptr - _x; }
void operator delete (void*) noexcept {}
#endif

using namespace std;

char string_in_buffer[(int)2e6];


void fast_scan(int &x) { scanf("%d", &x); }
void fast_scan(long long &x) { scanf("%lld", &x); }
void fast_scan(unsigned long long &x) { scanf("%llu", &x); }
void fast_scan(double &x) { scanf("%lf", &x); }
void fast_scan(long double &x) { scanf("%Lf", &x); }
void fast_scan(char &x) {
	scanf("%c", &x);
	if (x == '\n') {
		fast_scan(x);
	}
}
void fast_scan(string &x) {
	scanf("%s", string_in_buffer);
	x = string(string_in_buffer);
}

template<class TFirst, class TSecond>
void fast_scan(pair<TFirst, TSecond> &p) {
	fast_scan(p.first);
	fast_scan(p.second);
}

template <class T>
void fast_scan(vector<T> &v) {
	for (auto &x : v) fast_scan(x);
}

void fast_print(const int &x) { printf("%d", x); }
void fast_print(const unsigned int &x) { printf("%u", x); }
void fast_print(const long long &x) { printf("%lld", x); }
void fast_print(const unsigned long long &x) { printf("%llu", x); }
void fast_print(const char &x) { printf("%c", x); };
void fast_print(__int128 x) {
	if (x == 0) { fast_print('0'); return; }
	if (x < 0) {
		fast_print('-');
		x = -x;
	}
	__int128 p = 1;
	while (x / (p * 10)) p *= 10;
	while (p) {
		__int128 symb = x / p;
		fast_print((int)symb);
		x -= p * symb;
		p /= 10;
	}
};
void fast_print(const double &x) { printf("%.15lf", x); }
void fast_print(const long double &x) { printf("%.15Lf", x); }
void fast_print(const string &x) { printf("%s", x.c_str());}
void fast_print(const char v[]) { fast_print((string)v); }

template<class TFirst, class TSecond>
void fast_print(const pair<TFirst, TSecond> &p) {
	fast_print(p.first);
	fast_print(' ');
	fast_print(p.second);
}

template <class T>
void fast_print(const vector<T> &v) {
	if (v.empty()) return;
	fast_print(v[0]);
	for (int i = 1; i < v.size(); i++) {
		fast_print(' ');
		fast_print(v[i]);
	}
}

template <class T>
void fast_print(const vector<vector<T>> &v) {
	if (v.empty()) return;
	fast_print(v[0]);
	for (int i = 1; i < v.size(); i++) {
		fast_print('\n');
		fast_print(v[i]);
	}
}

template <class T>
void fast_print(const T &v) {
	for (const auto &x : v) {
		fast_print(x);
		fast_print(' ');
	}
}


using namespace std;


namespace smart_io {
	string print_start = "";
	string sep = " ";
	bool first_print = false;
	
	void precall_print() {
		fast_print(print_start);
		print_start = "\n";
		first_print = true;
	}
	
	void _print(deque<string>) {}
	template<class T, class... Args>
	void _print(deque<string> names, T elem, Args... args) {
		if (!first_print) {
			fast_print("\n");
		} else {
			first_print = false;
		}
		fast_print(names.front());
		fast_print(" = ");
		fast_print(elem);
		names.pop_front();
		_print(names, args...);
	}
} //namespace smart_io


template <class T>
ostream &operator,(ostream &os, const T &object) {
	if (!smart_io::first_print) {
		fast_print(smart_io::sep);
	} else {
		smart_io::first_print = false;
	}
	fast_print(object);
	return os;
}

template <class T>
istream &operator,(istream &is, T &object) {
	fast_scan(object);
	return is;
}

namespace random {
	using namespace std::chrono;
	mt19937 rng(duration_cast< milliseconds >(
											  system_clock::now().time_since_epoch()
											  ).count());
	uniform_real_distribution<> prob_dist(0.0, 1.0);
};

namespace typedefs {
	typedef long long ll;
	typedef unsigned long long ull;
	typedef pair<int, int> pii;
	typedef long double ld;
}

namespace numbers_operation {
	template<class T>
	T floor_mod(T a, T b) {
		if (a >= 0 && b >= 0) return a % b;
		if (a <= 0 && b <= 0) return a % b;
		return abs(b) - (abs(a) % abs(b));
	}
}

using namespace numbers_operation;
using namespace typedefs;
using namespace random;

int n, m;
string s;

const ll MOD = 1e9 + 7;
template<ll MOD>
struct Ring {
	ll value = 0;
	Ring() {}
	Ring(int _value) {
		value = _value;
		value = floor_mod(value, MOD);
	}
	Ring(ll _value) {
		value = _value;
		value = floor_mod(value, MOD);
	}
	Ring pow(ll p) const {
		if (p == 0) return 1;	
		if (p & 1) {
			return Ring(value).pow(p - 1) * value;
		} else {
			Ring sub = Ring(value).pow(p / 2);
			return sub * sub;
		}
	}
	Ring inv() const {
		return pow(MOD - 2);
	}
	void operator*=(const Ring<MOD> &b) {
		value *= b.value;
		value = floor_mod(value, MOD);
	}
	friend Ring operator*(Ring<MOD> a, const Ring<MOD> &b) {
		a *= b;
		return a;
	}
	void operator+=(const Ring<MOD> &b) {
		value += b.value;
		value = floor_mod(value, MOD);
	}
	friend Ring operator+(Ring a, const Ring &b) {
		a += b;
		return a;
	}
	void operator-=(const Ring<MOD> &b) {
		value -= b.value;
		value = floor_mod(value, MOD);
	}
	friend Ring operator-(Ring a, const Ring &b) {
		a -= b;
		return a;
	}
	void operator/=(const Ring<MOD> &b) {
		(*this) *= b.inv();	
	}
	friend Ring operator/(Ring a, const Ring &b) {
		a /= b;
		return a;
	}
	bool operator==(const Ring<MOD> &b) {
		return value == b.value;
	}
	bool operator!=(const Ring<MOD> &b) {
		return value != b.value;
	}
	friend void fast_print(const Ring<MOD> &b) {
		fast_print(b.value);
	}
};

typedef Ring<MOD> num;

signed main(signed argc, char *argv[]) {
	scan n, m;
	scan s;
	if (count(s.begin(), s.end(), s[0]) == len(s)) {
		vector<num> dp(n + 1);
		vector<num> dpR(n + 1);
		dp[0] = 1;
		dpR[0] = 1;
		for (int i = 1; i <= n; i++) {
			dp[i] = (i >= 2 ? (dpR[i - 2]) : 0);
			// for (int j = 2; j <= i; j++) {
			// 	dp[i] += dp[i - j];
			// }

			dpR[i] = dp[i] + dpR[i - 1];
		}
		num final = 0;
		// for (int a = 0; a <= n; a++) 
		// 	for (int b = 0; a + b + 1 <= n; b++) 
		// 		if (a || b) {
		// 			final += dp[n - a - b - 1];
		// 		}
		for (int i = 0; i <= n; i++) {
			int sum = n - 1 - i;
			if (sum > 0) {
				final += dp[i] * (sum + 1);
			}
		}
		print final + 1;
		return 0;
	}
	if (n & 1) {
		print 0;
		return 0;
	}
	if (s[0] == 'B') {
		for (char &c : s) 
			c = (c == 'R') ? 'B' : 'R';
	}
	int _max = 1e9;
	char pref = '!';
	int _size = 0;
	for (int i = 0; i < len(s); i++) {
		if (s[i] != pref) {
			if ((_size & 1) && pref == 'R')
				_max = min(_max, _size);
			if (_max == 1e9 && pref != '!') {
				_max = min(_max, _size | 1);
			}
			_size = 1;
		} else {
			_size++;
		}
		pref = s[i];
	}
	vector<num> dp(n + 1);
	vector<num> dpR(n + 1);
	dp[0] = 1;
	dpR[0] = 1;
	for (int i = 1; i <= n; i++) {
		int sub = (((i - min(i, _max + 1)) | 1) ^ 1) - 2;
		dp[i] = dpR[i - 2] - (sub >= 0 ? (dpR[sub]) : 0);
		// for (int j = 2; j <= min(i, _max + 1); j += 2)
			// dp[i] += dp[i - j];
		dpR[i] = dp[i] + dpR[i - 2];
	}
	num final = 0;
	// for (int a = 0; a <= n; a++)
	// 	for (int b = 0; a + b <= min(_max, n); b++)
	// 		if ((a + b) & 1)
	// 			if (n - a - b - 1 >= 0) {
	// 				final += dp[n - a - b - 1];
	// 			}
	for (int i = 0; i <= n; i++) {
		int sum = n - 1 - i;
		if ((sum & 1) && sum >= 0 && sum <= min(_max, n)) {
			final += dp[i] * (sum + 1);
		}
	}
	print final;
}


Measured memory_bytes: 3712