import std.conv, std.functional, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.container, std.math, std.numeric, std.range, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }


enum MO = 10L^^9 + 7;

int N;
int[] C;

void main() {
  try {
    for (; ; ) {
      N = readInt();
      C = new int[N];
      foreach (i; 0 .. N) {
        C[i] = readInt();
      }
      
      auto prev = new int[N];
      int[int] last;
      foreach (i; 0 .. N) {
        if (C[i] in last) {
          prev[i] = last[C[i]];
        } else {
          prev[i] = -1;
        }
        last[C[i]] = i;
      }
      
      auto dp = new long[N + 1];
      dp[0] = 1;
      foreach (i; 0 .. N) {
        dp[i + 1] = dp[i];
        if (prev[i] != -1 && i - prev[i] >= 2) {
          (dp[i + 1] += dp[prev[i] + 1]) %= MO;
        }
      }
      debug {
        writeln("dp = ", dp);
      }
      writeln(dp[N]);
    }
  } catch (EOFException e) {
  }
}
