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import java.util.*;
import java.io.*;

public class E {
    public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        PrintWriter out = new PrintWriter(System.out);
        int N = scanner.nextInt();
        int[] cnts = new int[26];
        for(int i = 0; i < N-1; i++) {
            char[] line = scanner.next().toCharArray();
            for(int j = 0; j < line.length; j++) {
                cnts[line[j]-'a']++;
            }
        }
        char[] last = scanner.next().toCharArray();
        int p = 0;
        while(p < last.length && last[p] == last[0]) p++;
        int ans = p;
        int c = last.length-1;
        if (last[last.length-1] == last[0]) {
            while(c >= 0 && last[c] == last[last.length-1]) c--;
        }
        if (cnts[last[0]-'a'] > 0) {
            if (c != last.length-1) ans += last.length-c;
            else ans++;
        }
        out.println(ans);
        out.flush();
    }
    
    public static class FastScanner {
        BufferedReader br;
        StringTokenizer st;
        
        public FastScanner(Reader in) {
            br = new BufferedReader(in);
        }
        
        public FastScanner() {
            this(new InputStreamReader(System.in));
        }
        
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
        
        int nextInt() {
            return Integer.parseInt(next());
        }
        
        long nextLong() {
            return Long.parseLong(next());
        }
        
        double nextDouble() {
            return Double.parseDouble(next());
        }
        
        String readNextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
        
        int[] readIntArray(int n) {
            int[] a = new int[n];
            for (int idx = 0; idx < n; idx++) {
                a[idx] = nextInt();
            }
            return a;
        }
    }
}
