#USER INPUT# -> :"dl"
#USER INPUT# -> :"ld"
#USER INPUT# -> :"ldr"
#USER INPUT# -> :"2.17.25"
#USER INPUT# -> :"2.28.25"
#USER INPUT# -> :""
#USER INPUT# -> :""
#USER INPUT# -> :""
#USER INPUT# -> :"c"
#USER INPUT# -> :"2.76*1.79*13"
#USER INPUT# -> :"q"
#USER INPUT# -> :"e"
#USER INPUT# -> :"e"
