What is the quantum state transmitted to Bob in BB84 protocol?

Application of Hadamard gates changes states $|0rangle$ and $|1rangle$ followingly:

• $mathrm{H}|0rangle = frac{1}{sqrt{2}}(|0rangle + |1rangle)$
• $mathrm{H}|1rangle = frac{1}{sqrt{2}}(|0rangle - |1rangle)$

Identity operator does not change the state in any way, i.e. $mathrm{I}|0rangle = |0rangle$ and $mathrm{I}|1rangle = |1rangle$.

Hence if gates $mathrm{HHHII}dots$ are applied on input string of qubits $|10101dotsrangle$, the result is state $|-+-01dotsrangle$.