When did the snail climb into the well?

A small snail accidentally fell into a dry well, and it lay at the bottom of the well and began to cry.

A frog crawled over and said to the snail in a strange voice, "Don't cry, little brother!" " It's no use crying. The shaft wall is too high. If you fall here, you can only live here. I have been here for many years! "

The little snail looked at the old and ugly frog and thought, "What a beautiful world outside the well! I don't want to live in a dark and cold well like it! " "

Thinking of this, the snail said to the frog, "uncle frog, I can't live here." I must climb up! " How deep is this well? "

"Ha ha ... what a joke! The depth of this well is10m. How can you climb up with such a heavy shell on your back at a young age? "

"I'm not afraid! As long as I climb for a while every day, I can always climb up! "

The next day, the little snail ate and drank enough and began to climb the wall. It keeps crawling! Climb up! Climbed until it was dark, and finally climbed 5 meters. The snail was very happy and thought, "At this rate, I can climb up tomorrow night." Thinking about it, it fell asleep unconsciously.

On the third morning, the snail was awakened by a purr. At first glance, it turned out that Uncle Frog was fast asleep! The snail was surprised: "How come I am so close to the bottom of the well?" It turned out that after it fell asleep, it slipped down 4 meters from the borehole wall. The snail sighed, gritted his teeth and began to climb again. It climbed another 5 meters, but slipped another 4 meters at night. Climb and climb ...

Kid, can you give the snail some confidence? Tell the snail that it will take several days to climb up and down the well.