fn f8823(s: &str) -> String {
    let isop = |c: char| c == 'c' || c == '+' || c == '-';
    // Sに数字が含まれていなかったり、cと+と-が先頭や最後に出てきたり2文字以上続いたらERRORと出力
    if !s.chars().any(|c| '0' <= c && c <= '9') {return "E0".to_string();}
    if isop(s.chars().nth(0).unwrap()) {return "E1".to_string();}
    if isop(s.chars().last().unwrap()) {return "E2".to_string();}
    if s.chars().collect::<Vec<_>>().windows(2).any(|w| isop(w[0]) && isop(w[1])) {return "E3".to_string();}
    let mut nums = vec!(0);
    for c in s.rsplitn(2, 'c').nth(0).unwrap().chars() {
        match c {
            '0' ... '9' => {let i = nums.len() - 1; nums[i] = nums[i] * 10 + c as i32 - '0' as i32},
            '+' => {nums.push(-1); nums.push(0);},
            '-' => {nums.push(-2); nums.push(0);},
            _ => ()
        }
    }
    // +は左辺に1を足し、-は右辺に1を引く
    for i in 0..nums.len() {
        match nums[i] {
            -1 => nums[i - 1] += 1,
            -2 => nums[i + 1] -= 1,
            _ => ()
        }
    }
    //nums.iter().filter(|&n| 0 <= *n).map(|i| i.to_string()).collect::<String>()
    //nums.iter().filter(|&n| 0 <= *n).map(|i| i.to_string()).collect::<Vec<_>>().join("")
    nums.iter().filter(|&n| 0 <= *n).fold(String::new(), |acc, i| acc + &i.to_string())
}
fn main() {
    for s in vec!["", "c", "+", "-", "c1", "+1", "-1", "1c", "1+", "1-", "1cc1", "1++1", "1--1", "1c+-1", "0", "1", "0c1c2", "119+5", "119-5", "119c5", "1+1-1", "1+1+1", "1-1-1", "1-1+1"] {
        println!("{}\t{}", s, f8823(s));
    }
}

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