MHB Find force with Young's modulus

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To calculate the force applied by a piano tuner to stretch a steel wire, Young's modulus (E) for steel is given as 20.0 x 10^10 Pa. The original length (L_0) of the wire is 1.35 m, and the change in length (ΔL) is 8.5 mm, converted to meters as 0.0085 m. The radius (r) of the wire is 0.425 mm, or 4.25 x 10^-4 m. The formula for force (F) is F = E * π * r^2 * ΔL / L_0, which incorporates these values to determine the force in Newtons. This calculation is essential for understanding the mechanical properties of materials under stress.
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Q: Calculate the force (in N) a piano tuner applies to stretch a steel piano wire 8.50 mm, if the wire is originally 0.850 mm in diameter and 1.35 m long. (Young's modulus for steel is 20.0 ✕ 1010 Pa.)

Work F=Y*A*change in L/L_0

I have no idea what is L_0 and L_f? Please help me.
 
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$L = 1.35 \, m$

$\Delta L = 8.5 \times 10^{-3} \, m$

$r = 4.25 \times 10^{-4} \, m$

$E=2.0 \times 10^{11} \, N/m^2$$F = \dfrac{E \cdot \pi r^2 \cdot \Delta L}{L}$

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