#include <bits/stdc++.h>
#define ff first
#define ss second
#define tcT template<class T
#define fastio ios::sync_with_stdio(false);cin.tie(nullptr);
#define ln '\n'
#define nwln cout<<ln;
using namespace std;
tcT> using vr = vector<T>;
using pi = pair<int, int>;
using vi = vr<int>;
using vpi = vr<pi>;
#define fri(i,a,b) for(int i=(a); i<(b); ++i)
#define each(x, a) for(auto& x: a)
#define sz(x) int((x).size())
#define phb push_back
#define eb emplace_back
const int MX = (int) 5e5+3;
int N, M, par[MX], len[MX], deg[MX], ans;
vpi bus;
vi fathers;
inline int find(int u) {
if(par[u] == u) return u;
return par[u] = find(par[u]);
}
void uni(int u, int v) {
u = find(u), v = find(v);
if(u == v) return;
if(len[u] < len[v]) swap(u, v);
par[v] = u, len[u] += len[v];
}
int main()
{
fastio
cin>>N>>M;
fri(i,1,N+1) par[i] = i, len[i] = 1;
while(M--) {
int u, v;
char ty;
cin>>u>>v>>ty;
if(ty == 'A') bus.eb(u, v);
else uni(find(u), find(v));
}
fri(i,1,N+1) {
if(par[i] == i) fathers.eb(i);
}
set<pi> orz;
each(z, bus) {
z.ff = find(z.ff), z.ss = find(z.ss);
if(z.ff == z.ss) continue;
orz.insert(z);
}
each(z, orz) ++deg[z.ff], ++deg[z.ss];
each(x, fathers) {
if(deg[x] == sz(fathers)-1) ans += len[x];
}
cout<<ans<<ln;
return 0;
}
