let mut output_hashes: Vec<Vec<u8>> = Vec::new();
    let rounds = sp1_zkvm::io::read::<u32>();
    for i in 0..rounds {
        let sha_input = [1u8; 32];
        let mut hasher = Sha256::new();
        hasher.update(&sha_input);
        output_hashes.push(hasher.finalize().to_vec());
    };
    let output: Output = Output {
        sha256_hashes: output_hashes,
    };
    sp1_zkvm::io::commit(&output);

    // read the input
    let rounds: u32 = env::read();
    let mut output_hashes: Vec<Digest> = Vec::new();
    // test sha256
    for i in 0..rounds {
        let sha_input = [1u8; 32];
        let sha_hash: Digest = *Impl::hash_bytes(&sha_input);
        output_hashes.push(sha_hash);
    }
    let output: Output = Output {
        sha256_hashes: output_hashes,
    };
    env::commit(&output);