First ABC

AtCoder

IDabc311_a

Time2000ms

Memory256MB

Difficulty—

You are given a string $S$ consisting of `A`, `B`, and `C`. $S$ is guaranteed to contain all of `A`, `B`, and `C`. If the characters of $S$ are checked one by one from the left, how many characters will have been checked when the following condition is satisfied for the first time? * All of `A`, `B`, and `C` have appeared at least once. ## Constraints * $3 \leq N \leq 100$ * $S$ is a string of length $N$ consisting of `A`, `B`, and `C`. * $S$ contains all of `A`, `B`, and `C`. ## Input The input is given from Standard Input in the following format: $N$ $S$ [samples]

Samples

Input #1

5
ACABB

Output #1

4

In the first four characters from the left, `A`, `B`, and `C` appear twice, once, and once, respectively, satisfying the condition.  
The condition is not satisfied by checking three or fewer characters, so the answer is $4$.

Input #2

4
CABC

Output #2

3

In the first three characters from the left, each of `A`, `B`, and `C` appears once, satisfying the condition.

Input #3

30
AABABBBABABBABABCABACAABCBACCA

Output #3

API Response (JSON)

{
  "problem": {
    "name": "First ABC",
    "description": {
      "content": "You are given a string $S$ consisting of `A`, `B`, and `C`. $S$ is guaranteed to contain all of `A`, `B`, and `C`. If the characters of $S$ are checked one by one from the left, how many characters wi",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc311_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a string $S$ consisting of `A`, `B`, and `C`. $S$ is guaranteed to contain all of `A`, `B`, and `C`.\nIf the characters of $S$ are checked one by one from the left, how many characters wi...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments