# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.

last="";
read N
for (( i=0; i<N; i++ )); do
    read Pi
    echo $Pi
done | sort -n | while read current;
do
    if [[ -z $last ]]
    then
        last=$current;
        continue;
    fi

    currentDiff=$((last - current));
    if [[ $currentDiff -lt 0 ]]
    then
        currentDiff=$((current - last))
    fi
    echo $currentDiff;

    last=$current;
done | sort -n | head -n 1