function solve(input) {


    let chislo = Number(input[0]);
    let input1 = input[1];
    let output = input[2];
    let final = 0;


    if (input1 === 'mm' && output === 'm') {

        final = chislo / 1000;
        console.log(final.toFixed(3));

    } else if (input1 === 'm' && output === 'cm') {

        final = chislo * 100;
        console.log(final.toFixed(3));

    } else if ( input1 === 'cm' && output === 'mm') {

        final = chislo * 10;
        console.log(final.toFixed(3));

    } else if (input1 === 'mm' && output === 'cm') {

        final = chislo / 10;
        console.log(final.toFixed(3));


    } else if (input1 === 'cm' && output === 'm') {

        final = chislo / 100;
        console.log(final.toFixed(3));


    } else if (input1 === 'm' && output === 'mm') {

        final = chislo * 1000;
        console.log(final.toFixed(3));


    }


}