#[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 ) * } };
}
#[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 , usize1 ) => { read_value ! ( $ next , usize ) - 1 };
    ( $ next : expr , $ t : ty ) => { $ next ( ) . parse ::<$ t > ( ) . expect ( "Parse error" ) };
}

fn pos_to_idx(p: i64) -> usize {
    (p + 8000) as usize
}

fn idx_to_pos(i: usize) -> i64 {
    i as i64 - 8000
}

fn main() {
    input! {
        s: chars,
        x: i64, y: i64
    }

    let ops = split(&s, 'T').into_iter().map(|v| v.len() as i64) .collect::<Vec<_>>();
    let ops_x = ops .iter().enumerate().filter_map(|(i, &v)| if i % 2 == 0 {Some(v)} else {None}).collect::<Vec<_>>();
    let ops_y = ops .iter().enumerate().filter_map(|(i, &v)| if i % 2 == 1 {Some(v)} else {None}).collect::<Vec<_>>();
    let mut dp_x = vec![VecMap::new(vec![false;16001], pos_to_idx, idx_to_pos);ops_x.len()+1];
    let mut dp_y = vec![VecMap::new(vec![false;16001], pos_to_idx, idx_to_pos);ops_y.len()+1];
    dp_x[0][0] = true;
    dp_y[0][0] = true;
    for i in 0..ops_x.len() {
        for j in dp_x[0].keys() {
            if j + ops_x[i] <= 8000 {
                dp_x[i+1][j + ops_x[i]] |= dp_x[i][j];
            }
            if i >= 1 && j - ops_x[i] >= -8000 {
                dp_x[i+1][j - ops_x[i]] |= dp_x[i][j];
            }
        }
    }
    for i in 0..ops_y.len() {
        for j in dp_y[0].keys() {
            if j + ops_y[i] <= 8000 {
                dp_y[i+1][j + ops_y[i]] |= dp_y[i][j];
            }
            if j - ops_y[i] >= -8000 {
                dp_y[i+1][j - ops_y[i]] |= dp_y[i][j];
            }
        }
    }

    println!("{}", if dp_x[ops_x.len()][x] && dp_y[ops_y.len()][y] {"Yes"} else {"No"});
}

#[allow(dead_code)]
fn split<T: PartialEq + Clone>(slice: &[T], sep: T) -> Vec<Vec<T>> {
    slice.iter().fold(vec![vec![]], |mut acc, x| {
        if x == &sep {
            acc.push(vec![]);
            acc
        } else {
            let last = acc.len() - 1;
            acc[last].push(x.clone());
            acc
        }
    })
}

#[allow(dead_code)]
#[derive(Debug, Clone)]
struct VecMap<K, V> {
    vec: Vec<V>,
    idx: fn(K) -> usize,
    rev: fn(usize) -> K,
}
#[allow(dead_code)]
impl<K, V> VecMap<K, V> {
    fn new(vec: Vec<V>, idx: fn(K) -> usize, rev: fn(usize) -> K) -> VecMap<K, V>
    {
        VecMap {
            vec: vec,
            idx: idx,
            rev: rev,
        }
    }
}
#[allow(dead_code)]
impl<K, V> VecMap<K, V> {
    fn keys(&self) -> Vec<K> {
        (0..self.vec.len()).map(|i| (&self.rev)(i)).collect()
    }
}
#[allow(dead_code)]
impl<K, V> std::ops::Deref for VecMap<K, V> {
    type Target = Vec<V>;
    fn deref(&self) -> &Self::Target {
        &self.vec
    }
}
#[allow(dead_code)]
impl<K, V> std::ops::Index<K> for VecMap<K, V> {
    type Output = V;
    fn index(&self, index: K) -> &V {
        &self.vec[(&self.idx)(index)]
    }
}
#[allow(dead_code)]
impl<K, V> std::ops::IndexMut<K> for VecMap<K, V> {
    fn index_mut(&mut self, index: K) -> &mut V {
        &mut self.vec[(&self.idx)(index)]
    }
}

Measured memory_bytes: 168188