function solve(input){
    input.pop();
    let str = input.shift();
    input.forEach(line => {
        command = line.split('>>>');
        let instruction = command[0];

        if(instruction === 'Contains'){
            let substring = command[1];
            if(str.includes(substring)){
                console.log(`${str} contains ${substring}.`)
            }
            else{
                console.log('Substring not found!')
            }
        }

        if(instruction === 'Flip'){
            let direction = command[1];
            let startIndex = command[2];
            let endIndex = command[3];

            let substring = str.substring(startIndex, endIndex);
            if(direction === 'Upper'){
                substring = substring.toUpperCase();
            }

            if(direction === 'Lower'){
                substring = substring.toLowerCase();
            }

            str = str.substring(0,startIndex) + substring + str.substring(endIndex);
            console.log(str);
        }

        if(instruction === 'Slice') {
            let startIndex = command[1];
            let endIndex = command[2];
            str = str.split('');
            str.splice(startIndex, endIndex - startIndex);
            str = str.join('');
            console.log(str);
        }

    })
    console.log(`Your activation key is: ${str}`)
}

solve([
'abcdefghijklmnopqrstuvwxyz',
'Slice>>>2>>>6',
'Flip>>>Upper>>>3>>>14',
'Flip>>>Lower>>>5>>>7',
'Contains>>>def',
'Contains>>>deF',
'Generate'
  ]
  )