```cpp #include<bits/stdc++.h> using namespace std; const int Mod=97654321,N=250+5; vectorG[57]; int f[N<<1][N][57]; inline int id(char c){return c>='a'&&c<='z'?c-'a'+1:c-'A'+1+26;}

int main(){ios::sync_with_stdio(False);cin.tie(0);cout.tie(0); int U,L,P;cin>>U>>L>>P;char c1,c2; for(int i=1;i<=P;++i){cin>>c1>>c2;G[id(c1)].push_back(id(c2));} memset(f,0,sizeof(f)); for(int i=1;i<=26;++i){f[1][0][i]=1;f[1][1][i+26]=1;} for(int i=2;i<=U+L;++i) for(int j=0;j<=U;++j) for(int x=1;x<=52;++x) for(int y:G[x]) if(y<=26)(f[i][j][y]+=f[i-1][j][x])%=Mod; else (f[i][j+1][y]+=f[i-1][j][x])%=Mod; int ans=0;for(int i=1;i<=52;++i)(ans+=f[U+L][U][i])%=Mod; cout<<ans<<endl;return 0;}

#include<bits/stdc++.h>
using namespace std;
const int Mod=97654321,N=250+5;;
vector<int>G[57];
int f[N<<1][N][57];
inline int id(char c){return c>='a'&&c<='z'?c-'a'+1:c-'A'+1+26;}

int main(){
	ios::sync_with_stdio(False);cin.tie(0);cout.tie(0);
	int U,L,P;cin>>U>>L>>P;
	char c1,c2;
	for(int i=1;i<=P;++i){
		cin>>c1>>c2;
		G[id(c1)].push_back(id(c2));
	}
    memset(f,0,sizeof(f));
	for(int i=1;i<=26;++i){
		f[1][0][i]=1;
		f[1][1][i+26]=1;
	}
	for(int i=2;i<=U+L;++i)
		for(int j=0;j<=U;++j)
			for(int x=1;x<=52;++x)
				for(int y:G[x])
					if(y<=26)(f[i][j][y]+=f[i-1][j][x])%=Mod;
					else           (f[i][j+1][y]+=f[i-1][j][x])%=Mod;
    int ans=0;
	for(int i=1;i<=52;++i)
		(ans+=f[U+L][U][i])%=Mod;
	cout<<ans<<endl;
	return 0;
}