Series or Physics?

A bar of length $a$ is at zero temperature. At $t=0$ , the end $x=a$ is raised to a temperature $u_0$ and the end $x=0$ is insulated. If the temperature at any point $x$ of the bar at any time $t>0$ , assuming that the surface of the bar is insulated, can be expressed as:

$\displaystyle u(x,t)=u_0+\frac{Au_0}{\pi^B}\sum_{n=1}^{\infty}\frac{(-1)^n}{(2n-1)}e^{-\frac{(2n-1)^C\pi^Dc^2t}{Fa^G}}\cos\left( \frac{(2n-1)\pi x^H}{Ia^J} \right)$

Evaluate $A+B+C+D+F+G+H+I+J$

Details and Assumptions:

Here, $c$ is arbitrary constant.