function solve() {
    let form=document.getElementById('container');
    let petList=document.querySelector('#adoption>ul');
    let adoptedList=document.querySelector('#adopted>ul');

    let [name,age,kind,owner,addBtn]=Array.from(form.children);
    addBtn.addEventListener('click',addPet);

    function addPet(e){
        e.preventDefault();
        if(!(name.value && Number(age.value) && kind.value && owner.value)){
            return;
        }
        let li=document.createElement('li');
        let p=document.createElement('p');
        p.innerHTML=`<strong>${name.value}</strong> is a <strong>${age.value}</strong> year old <strong>${kind.value}</strong>`
        let sOwner=document.createElement('span');
        sOwner.textContent=`Owner: ${owner.value}`;
        let contactBtn=document.createElement('button');
        contactBtn.textContent='Contact with owner';
        li.appendChild(p);
        li.appendChild(sOwner);
        li.appendChild(contactBtn);
        petList.appendChild(li);

        contactBtn.addEventListener('click',makeContact);
    }
    function makeContact(e){
        let parent=e.target.parentElement;
        e.target.remove();

        let takeBtn=el('button');
        takeBtn.textContent='Yes! I take it!';

        let div=el('div');
        let inputEl=el('input','',{ placeholder: 'Enter your names'});
        div.appendChild(inputEl);
        div.appendChild(takeBtn);
        parent.appendChild(div);

        takeBtn.addEventListener('click',(e)=>{
            if(!inputEl.value){
                return;
            }
            e.target.textContent='Checked';
            adoptedList.appendChild(e.target.parentElement.parentElement);

            let span=e.target.parentElement.parentElement.querySelector('span');
            span.textContent=`New Owner: ${inputEl.value}`;

            let checkBtn=el('button','Checked');
            e.target.parentElement.parentElement.appendChild(checkBtn);
            e.target.parentElement.remove();

            checkBtn.addEventListener('click',(ev)=>{
                ev.target.parentElement.remove();
            });
        });

    }
    function el(type,content,attributes){
        let result=document.createElement(type);
        if(content){
            result.textContent=content;
        }
        if(attributes){
            Object.assign(result,attributes);
        }
        return result;

    }

}