function solve(input) {

let activationKey = input.splice(0,1).toString()
let commands = input.shift();

while(commands !== 'Generate'){

 let separatedCommands = commands.split('>>>');
 if(separatedCommands[0] === 'Slice'){
    let newStr = ''
     let startIndex = Number(separatedCommands[1]);
     let endIndex = Number(separatedCommands[2]);
     if((startIndex >= 0 && endIndex >= 0) && (startIndex < activationKey.length && activationKey.length > endIndex)){
 let slicedActivationKey = activationKey.substring(startIndex,endIndex);
 newStr = activationKey.replace(slicedActivationKey,'');
 activationKey = newStr;
 console.log(activationKey);
     }
 }else if(separatedCommands[0] === 'Flip'){
     if(separatedCommands [1] === 'Upper'){
        let startIndex = Number(separatedCommands[2]);
        let endIndex = Number(separatedCommands[3]);
        let neededChar =  activationKey.substring(startIndex,endIndex);
        let changedneededChar = neededChar.toUpperCase();
        let replaced = activationKey.replace(neededChar,changedneededChar)
        activationKey = replaced;
        console.log(activationKey);
     }else if(separatedCommands[1] === 'Lower'){
        let startIndex = Number(separatedCommands[2]);
        let endIndex = Number(separatedCommands[3]);
        let neededChar =  activationKey.substring(startIndex,endIndex);
        let changedneededChar = neededChar.toLowerCase();
        let replaced = activationKey.replace(neededChar,changedneededChar);
        activationKey = replaced;
        console.log(activationKey);
     }
 }else if(separatedCommands[0] === 'Contains'){
     let neededSubstringg = separatedCommands[1];
     if(activationKey.includes(neededSubstringg)){
         console.log(`${activationKey} contains ${neededSubstringg}.`);
     }else{
         console.log(`Substring not found!`);
     }
 }
commands = input.shift()
}

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

}