use std::ops::{Add, Mul, Rem};

const MOD: i64 = 1_000_000_007;

fn main() {
    let stdin = std::io::stdin();
    let mut locked = stdin.lock();
    let mut sc = scanner::Scanner::new(&mut locked);

    let s = sc.next_bytes();
    let mut dp = vec![vec![0i64; 4]; s.len() + 1];
    dp[0][0] = 1;
    for (i, &c) in s.iter().enumerate() {
        if c == b'A' {
            dp[i + 1][1] = dp[i + 1][1].add(dp[i][0]).rem(MOD);
            dp[i + 1][0] = dp[i + 1][0].add(dp[i][0]).rem(MOD);
            dp[i + 1][1] = dp[i + 1][1].add(dp[i][1]).rem(MOD);
            dp[i + 1][2] = dp[i + 1][2].add(dp[i][2]).rem(MOD);
            dp[i + 1][3] = dp[i + 1][3].add(dp[i][3]).rem(MOD);
        } else if c == b'B' {
            dp[i + 1][2] = dp[i + 1][2].add(dp[i][1]).rem(MOD);
            dp[i + 1][0] = dp[i + 1][0].add(dp[i][0]).rem(MOD);
            dp[i + 1][1] = dp[i + 1][1].add(dp[i][1]).rem(MOD);
            dp[i + 1][2] = dp[i + 1][2].add(dp[i][2]).rem(MOD);
            dp[i + 1][3] = dp[i + 1][3].add(dp[i][3]).rem(MOD);
        } else if c == b'C' {
            dp[i + 1][3] = dp[i + 1][3].add(dp[i][2]).rem(MOD);
            dp[i + 1][0] = dp[i + 1][0].add(dp[i][0]).rem(MOD);
            dp[i + 1][1] = dp[i + 1][1].add(dp[i][1]).rem(MOD);
            dp[i + 1][2] = dp[i + 1][2].add(dp[i][2]).rem(MOD);
            dp[i + 1][3] = dp[i + 1][3].add(dp[i][3]).rem(MOD);
        } else {
            dp[i + 1][1] = dp[i + 1][1].add(dp[i][0]).rem(MOD);
            dp[i + 1][2] = dp[i + 1][2].add(dp[i][1]).rem(MOD);
            dp[i + 1][3] = dp[i + 1][3].add(dp[i][2]).rem(MOD);
            dp[i + 1][0] = dp[i + 1][0].add(dp[i][0] * 3).rem(MOD);
            dp[i + 1][1] = dp[i + 1][1].add(dp[i][1] * 3).rem(MOD);
            dp[i + 1][2] = dp[i + 1][2].add(dp[i][2] * 3).rem(MOD);
            dp[i + 1][3] = dp[i + 1][3].add(dp[i][3] * 3).rem(MOD);
        }
    }
    println!("{}", dp[s.len()][3]);
}

mod scanner {
    use std::io::{BufRead, Error, ErrorKind, Read};
    use std::str::FromStr;

    pub struct Scanner<'a, R>
    where
        R: 'a + BufRead + ?Sized,
    {
        reader: &'a mut R,
    }

    impl<'a, R> Scanner<'a, R>
    where
        R: 'a + BufRead + ?Sized,
    {
        pub fn new(reader: &'a mut R) -> Self {
            Scanner { reader: reader }
        }

        #[allow(dead_code)]
        pub fn next_byte(&mut self) -> u8 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .next()
                .unwrap()
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_bytes(&mut self) -> Vec<u8> {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .collect::<Result<Vec<u8>, _>>()
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_unsigned(&mut self) -> u64 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .fold(Ok(0), |s, x| {
                    s.and_then(|t| {
                        x.and_then(|y| {
                            if b'0' <= y && y <= b'9' {
                                Ok(t * 10 + (y - b'0') as u64)
                            } else {
                                Err(Error::new(ErrorKind::InvalidData, "found not a digit"))
                            }
                        })
                    })
                })
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_signed(&mut self) -> i64 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .fold(Ok([0i64, 0]), |s, x| {
                    x.and_then(|y| {
                        s.and_then(|t| {
                            if t[0] == 0 && y == b'-' {
                                Ok([-1, 0])
                            } else if b'0' <= y && y <= b'9' {
                                Ok([
                                    if t[0] == 0 { 1 } else { t[0] },
                                    t[1] * 10 + (y - b'0') as i64,
                                ])
                            } else {
                                Err(Error::new(ErrorKind::InvalidData, "found not a digit"))
                            }
                        })
                    })
                })
                .and_then(|s| Ok(s[0] * s[1]))
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_float(&mut self) -> f64 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .collect::<Result<Vec<u8>, Error>>()
                .and_then(|t| {
                    String::from_utf8(t).or(Err(Error::new(ErrorKind::InvalidData, "invalid data")))
                })
                .and_then(|s| {
                    f64::from_str(&s).or(Err(Error::new(ErrorKind::InvalidData, "invalid data")))
                })
                .unwrap()
        }

        fn is_printable(c: u8) -> bool {
            0x21 <= c && c <= 0x7e
        }
    }
}


Measured memory_bytes: 10492