Topological sort

Jobs $A$, $B$, $\dots$, $J$ have the following dependencies: $D$ depends on $A$, $D$ on $B$, $H$ on $D$, $F$ on $E$, $H$ on $E$, $C$ on $B$, $I$ on $E$, $G$ on $I$, $F$ on $C$, $G$ on $C$, $E$ on $D$, $G$ on $F$, $J$ on $I$.

In which order should the jobs be performed to take all the dependencies into account? Print a possible order in the field below. For example, your output may look like this:

A G F D