public static long exponentLength(final Bytes input) {
    return extractParameterLong(input, EXPONENT_LENGTH_OFFSET, PARAMETER_LENGTH);
  }
Exponent length.

@param input the input
@return the long
evm/src/main/java/org/hyperledger/besu/evm/precompile/BigIntegerModularExponentiationPrecompiledContract.java