#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};

    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };

    ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, bytes) => {
        read_value!($next, String).into_bytes()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_imports)]
use std::cmp::{max, min};
#[allow(unused_imports)]
use std::collections::{BinaryHeap, HashMap};

#[allow(dead_code)]
type Graph = Vec<Vec<usize>>;

const CENTER: usize = 8000;

fn main() {
    input! {
        s: chars,
        x: i64, y: i64,
    }
    let mut pre = -1;
    let mut fs = vec![];
    for i in 0..s.len() {
        if s[i] == 'T' {
            fs.push((i as i64 - pre - 1) as usize);
            pre = i as i64;
        }
    }
    fs.push((s.len() as i64 - 1 - pre) as usize);

    let mut xs = vec![];
    let mut ys = vec![];
    for i in 1..fs.len() {
        if i & 1 == 0 {
            xs.push(fs[i]);
        } else {
            ys.push(fs[i]);
        }
    }

    let mut xv = vec![vec![false; CENTER * 2 + 10]; 2];
    let mut yv = vec![vec![false; CENTER * 2 + 10]; 2];
    xv[0][CENTER + fs[0]] = true;
    yv[0][CENTER] = true;

    for i in 0..xs.len() {
        let c = i % 2;
        let n = (i + 1) % 2;
        for j in 0..CENTER * 2 + 1 {
            xv[n][j] = false;
        }
        for j in 0..CENTER * 2 + 1 {
            if xv[c][j] {
                xv[n][j + xs[i]] = true;
                xv[n][j - xs[i]] = true;
            }
        }
    }
    for i in 0..ys.len() {
        let c = i % 2;
        let n = (i + 1) % 2;
        for j in 0..CENTER * 2 + 1 {
            yv[n][j] = false;
        }
        for j in 0..CENTER * 2 + 1 {
            if yv[c][j] {
                yv[n][j + ys[i]] = true;
                yv[n][j - ys[i]] = true;
            }
        }
    }

    if xv[xs.len() % 2][(CENTER as i64 + x) as usize]
        && yv[ys.len() % 2][(CENTER as i64 + y) as usize]
    {
        println!("Yes");
    } else {
        println!("No");
    }
}


Measured memory_bytes: 4352